[HN Gopher] 80/20 Aluminum T-slot Building Systems - Build your ...
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       80/20 Aluminum T-slot Building Systems - Build your Idea
        
       Author : thunderbong
       Score  : 255 points
       Date   : 2023-01-29 12:03 UTC (10 hours ago)
        
 (HTM) web link (8020.net)
 (TXT) w3m dump (8020.net)
        
       | ur-whale wrote:
       | I you're close to the EU, I recommend these guys:
       | 
       | https://www.motedis.com/en
       | 
       | They'll pre-cut everything you need and send it to you.
       | 
       | If you're into aluminum extrusions, here's a sample:
       | 
       | https://www.motedis.com/en/Slot-profiles
        
       | hinkley wrote:
       | There's a guy on YouTube who makes conversion vans using this
       | stuff. He has figured out a bunch of tricks with it, but the one
       | thing I feel like he hasn't figured out is that he's losing a
       | cubic foot per cabinet by not exploiting the void behind the
       | posts.
        
       | sgt wrote:
       | I recently used aluminium extrusions to build a window. Built a
       | "perfect" frame, stuffed glazing putty into the spaces, then fit
       | a glass in, which I had cut to size. Needed a DIY job as it was
       | just for my garden house. There's more to a proper window than
       | _just_ the glass and frame.
        
       | Quequau wrote:
       | I wonder how much outfits like Send Cut Send are eating into
       | 80/20's market share. I know I've used laser cut sheet stock for
       | a few projects that probably would have used aluminium extrusions
       | in the past.
        
         | doctorwho42 wrote:
         | Probably not as much as Chinese extrusions have. You can find
         | some pretty cheap and compatible aluminum extrusion on the
         | internet these days. Ebay used to be the best, but now there
         | are dedicated websites and everything. Extrusions have never
         | been cheaper
        
           | fbnlsr wrote:
           | Are you sure? I've been looking at getting myself a sim
           | racing rig made of aluminium extrusion and prices have
           | skyrocketed in the past couple of years.
           | 
           | I'd love to get some links on those cheaper extrusion
           | websites you're talking about.
        
         | ama5322 wrote:
         | I doubt much if we think decades. Sheet stock has always been
         | used in conjunction to modular systems such as these, via
         | manual or CNC machining (slots and holes are trivial to do).
         | The advantage of a modular system such as these is the ability
         | to build a scaffold with only straight cuts and a few off-the-
         | shelf connectors.
         | 
         | In most cases you need a sheet metal press to form a scaffold
         | out of _just_ sheet metal.
         | 
         | For anything structural (ie: when thickness matters), the price
         | of custom-cut sheet stock is not that competitive anymore.
         | 
         | The price of machine-cut metal sheet has dropped quite a bit
         | the last years though. I think it's filling a new niche, not
         | really replacing the space of modular extrusions.
        
       | strken wrote:
       | I've been looking at aluminium extrusion videos on youtube for
       | the past half-hour trying to work out how the dies have a
       | circular void in the middle.
       | 
       | Turns out it's a second die (called a mandrel) that locks into
       | the main die (called a cap), and the hot pressurised aluminium
       | flows around the mandrel then forms back into one piece as it
       | goes through the cap.
        
         | raisedbyninjas wrote:
         | Same as the play-dough tube extruder.
        
         | MengerSponge wrote:
         | It's the same as pasta, but with different temperatures and
         | tolerances!
        
         | iancmceachern wrote:
         | The coolest part (pun intended) is how they cool the semi-
         | melted aluminum after extrusion, in long tanks of water, that
         | have no sides, the sides are made from water pressure made from
         | directing water flow.
        
           | engineer_22 wrote:
           | Please provide a link, this sounds insane
        
             | iancmceachern wrote:
             | This is the best I could find quickly:
             | https://m.alibaba.com/product/1600594223702/Quench-
             | Cooling-T...
        
       | rco8786 wrote:
       | Anybody into sim racing will be intimately familiar with this
       | system. Very strong, very versatile.
        
         | philjohn wrote:
         | Came here to say the same thing. So many pre-made kits using
         | it, and plenty of people who DIY a sim racing cockpit with it.
         | SimRacingGarage has reviewed some 6DOF rigs which use 8020 at
         | their core.
        
       | sam_goody wrote:
       | The wooden GridBeam system was trending a few hours ago, and I
       | assume it reminded someone to post this.
       | 
       | But if you missed it, and these things interest you, check that
       | out as well: https://news.ycombinator.com/item?id=34565675
        
       | tguvot wrote:
       | Spent last couple of weeks browsing this site and other 80/20
       | sites. There is an online cad program specially made for 80/20
       | https://item.engineering/AUen/tools/engineeringtool/ . And some
       | guy who makes woodworking jigs from extruded aluminum
       | https://www.youtube.com/@jisakukobo/videos
        
       | 14 wrote:
       | Last I checked it was hard or expensive after shipping and duty
       | to get this stuff. I am on Vancouver Island and would love to get
       | some of this stuff. Made me even consider starting a business
       | selling it.
        
       | pitched wrote:
       | The reason I haven't used these for a few past projects is that
       | they can't quite hold up under human-scale weights (1). Would be
       | awesome to have something like this but steel!
       | 
       | 1: https://us.misumi-ec.com/pdf/fa/2010/p2433.pdf
        
         | johnwalkr wrote:
         | That's only really useful to compare sizes. Normally you just
         | build your structure with as many supports etc as needed. And
         | 30 degree, 60 degree, 90 degree etc connecting pieces are
         | standard to add support struts.
        
         | toss1 wrote:
         | I've used 80/20 for a number of projrcts, but for a larger
         | project I found this steel square/rectangular tube system from
         | Flex Craft works well. No relation other than satisfied
         | customer. The people are also great to work with.
         | 
         | [0] flex-craft.com
        
         | kris_wayton wrote:
         | The chart doesn't seem to account for the profiles that only
         | have a slot on 1 or 2 sides versus all 4. I would guess those
         | are quite a bit stronger. Like this one:
         | https://8020.net/media/catalog/product/cache/9208ae76a38c408...
         | 
         | Edit: Their calculator shows the same exact deflection with the
         | same weight, so maybe not, though that seems odd to me.
         | https://8020.net/deflection-calculator
        
         | quickthrowman wrote:
         | You're looking for metal framing channel aka Unistrut (brand
         | name) aka strut (trade name). 12 ga steel is going to be far
         | stronger than extruded aluminum. It's heavily used in
         | commercial and industrial construction.
        
         | zeroping wrote:
         | You might look into Unistrut or the other compatible steel
         | strut channel.
        
         | MengerSponge wrote:
         | I've used all kinds of 8020 frames for things much larger and
         | heavier than humans. You just have to use larger cross-section
         | members:
         | https://www.facebook.com/229125947114533/photos/pb.100063454...
        
           | pitched wrote:
           | That's what the chart I linked says. To stand on a 1m length
           | suspended on both ends, a 2060 might work but a 2080 should
           | be safe. That's just a bit smaller than a much cheaper wooden
           | 1x4 though.
        
       | chendii wrote:
       | The popular open source option is www.openbuildspartstore.com
       | Availible via many resellers worldwide and even cloned.
        
       | IshKebab wrote:
       | The best place I've found in the UK to get aluminium extrusion is
       | KJN aluminium: https://www.aluminium-profile.co.uk/
       | 
       | They do Item and Bosch-Rexroth compatible extrusions for a
       | reasonable price. I'd probably go with Item because the official
       | BR stuff is a rip off and sooner or later you might want to buy
       | "official" parts.
        
       | viciousvoxel wrote:
       | Great to have another T-slot build system. Seems slightly pricier
       | than Makerbeam but a lot more profile sizes and options in
       | general. I wish there were more kits in their catalog.
        
         | 542458 wrote:
         | 80/20 has been around since the late 80s, and are kinda the
         | "classic" brand-name in aluminum extrusions. Popular for trade
         | shows and the like. They tend to be on the more expensive side
         | compared to Misumi or other brands, but you can sometimes find
         | them cheap used on Craigslist.
        
           | kris_wayton wrote:
           | There's a US anti-dumping embargo on extruded aluminum, which
           | seems to keep the price high.
        
       | js2 wrote:
       | As an example of how you can use this stuff, here's a home-
       | theater screen frame with built-in horizontal masking, and plans
       | on how it could be extended to 4-way masking:
       | 
       | https://www.avsforum.com/threads/smx-simple-masking-experien...
        
       | LightRailTycoon wrote:
       | If you live near a Grainger or other industry supplier that will
       | sell to the public, it's much cheaper without shipping.
        
       | sschueller wrote:
       | These types of aluminum extrusions have been used for many years
       | (at least in Europe) in many industries to build all kinds
       | temporary to more permanent structures [1]. Also the reason they
       | ended up in 3d printers as they have been used in other CNC type
       | setups.
       | 
       | Oddly enough the Wikipedia article is very thing and not even
       | available in English [2]
       | 
       | [1] https://www.kanya.com/fileadmin/_processed_/3/1/csm_kanya-
       | ag...
       | 
       | [2] https://de.wikipedia.org/wiki/Konstruktionsprofil (German)
        
         | Dries007 wrote:
         | I think this is the equivalent page:
         | 
         | https://en.wikipedia.org/wiki/T-slot_structural_framing
        
           | rasz wrote:
           | I just merged them in wikidata
        
       | neilv wrote:
       | One of my startups used 80/20 successfully for the mechanical
       | structure of our networked factory stations (along with
       | industrial PC and sensors).
       | 
       | Designed, tested, refined&tuned, and built in Cambridge (USA).
       | Then broken down simply, to fit in a few pieces in boxes for
       | flight, and reassembled at the factory in Asia.
        
       | post_break wrote:
       | Try tnutz.com. I found them much cheaper for building stuff. They
       | cut it for you as well. Had to build some stuff for my truck and
       | they were the cheapest.
        
       | chiefalchemist wrote:
       | Intriguing. But the concept is new to me, and I found the site
       | not very n00b friendly.
       | 
       | My initial questions are:
       | 
       | Can I use it to build a greenhouse? And how much would that cost?
       | 
       | I couldn't find anything comparable, and left.
        
         | himinlomax wrote:
         | Simple square aluminium tubing would be cheaper and with
         | similar characteristics for this application. You can assemble
         | them quite easily with a drill and bolts/nuts/washers of the
         | appropriate size.
         | 
         | The advantage these profiles have is that they are more
         | precise, are more easily adjusted and allow for a wide range of
         | connections.
        
           | convolvatron wrote:
           | Add a portable bandsaw to your collection and raw stock is
           | probably ultimately more adaptable
        
             | linsomniac wrote:
             | I've done all of my extrusion cuts using my miter saw with
             | just the stock wood blade, I go a bit slow and the cut is
             | basically indistinguishable from the factory cuts. I assume
             | it'd do as well on tube stock, but if I was cutting large
             | diameter solid stock I'd probably go with a non-ferrous
             | blade.
        
         | tinco wrote:
         | You could but it would be extremely expensive, and not as
         | strong as a steel construction. If you are building a robot
         | that tends to the plants in your greenhouse however, this is a
         | great material to both build the skeleton of the robot, and the
         | structure that holds your plants. It allows you to quickly
         | prototype in a very precise and lightweight manner.
        
           | chiefalchemist wrote:
           | Thanks. Still intriguing, but now for other ideas / projects.
           | I wish the site was more transparent on their sweet spot.
        
             | sgc wrote:
             | The sweet spot for extrusions is usually convenient
             | precision. If you don't need relatively high precision and
             | accuracy, they are often overkill.
        
               | chiefalchemist wrote:
               | Well, it's a cool tech-y look as well.
        
       | iancmceachern wrote:
       | Also check out Misumi. They will cut it to length, tap, drill
       | holes, etc all just by configuring it woth part numbers. They Lso
       | have pre made assemblies, you can get it in black anodized, and
       | the pricing can't be beat, it's an order of magnitude less than
       | other suppliers when you get the customizations.
       | 
       | Also check out Vention, they'll design and build a whole machine
       | for you using the stuff
        
         | ddulaney wrote:
         | A former employer swore by FramingTech:
         | https://www.framingtech.com/
         | 
         | Their super power was that you could ship them a SolidWorks
         | file with assembly steps marked, then they would bag all of the
         | parts by step (i.e. for step 1 in the build book, use all the
         | parts in bag 1). Also, if you throw money at them you can get
         | it shipped next day, which is a good option to have.
        
         | tootie wrote:
         | I've used openbuilds before. They sell all sorts of aluminum
         | rails, wheels, brackets and motors. And they have a community
         | of designers posting builds for all sorts of machines.
         | 
         | https://openbuildspartstore.com/
        
         | lvl102 wrote:
         | Misumi is the only answer if you are building something with
         | precision. Also checkout accu.co.uk.
        
           | joshvm wrote:
           | Accu are fantastic. They also have European sites and maybe
           | more? Always my goto if we need weird screws and they will
           | also make to order if you need something special.
           | 
           | Edit : I would guess McMaster fills this role in the US, so
           | it's nice to have an alternative here. Also they have a lot
           | of non-standard lengths and things like tiny M2s or even
           | smaller. We used them all the time for machine vision
           | products (cameras often use M2 frame mounts, lenses with itty
           | bitty grub screws).
        
         | willis936 wrote:
         | A coworker of mine told me about Misumi last week. They're
         | pretty amazing and the prices are surprisingly great.
        
           | joshvm wrote:
           | They're pretty common in the 3D print industry. Also check
           | out IGUS, who also do a lot of custom rails/rods. They're
           | probably most well known for their plastic Drylin bearings.
           | The prices are also reasonable for what you can get.
           | 
           | I've been meaning to get some stuff from Makerbeam too, who
           | make 10x10 mm extrusion at a good price (not sure who else
           | makes small width stuff). Oozenest in the UK has a good
           | range.
        
         | w4rh4wk5 wrote:
         | We've used Misumi for a small-scale project and the quality /
         | price ratio was quite good. Would order again from them.
        
       | elkos wrote:
       | There's a 80/20 DIY Azimuth/Elevation rotator design by the
       | SatNOGS team: https://wiki.satnogs.org/SatNOGS_Rotator_v3
       | 
       | If you have access to a 3D printer and want to build a Az/El
       | rotator suitable for LEO satellites it could be a great weekend
       | project.
       | 
       | (You don't have to connect it to the SatNOGS network
       | https://network.satnogs.org of course, and you don't need to
       | build that to participate in the project)
        
       | s1mon wrote:
       | If you need to build a CAD model of 8020 frames, Onshape is a
       | collaborative, cloud based system which is a bit like Google docs
       | and Github for mechanical CAD. There's a bunch of tools to create
       | frame systems and they have the 8020 frame profiles built in.
       | 
       | https://www.onshape.com/en/features/frames
       | https://www.onshape.com/en/blog/announcing-onshape-frames
        
       | steaktartaar_ wrote:
       | I've been building out my sim racing setup with 8020 for the past
       | three years. It's a goodsend if you want to build something
       | durable, fast and cheap but can't work wood.
        
       | DoingIsLearning wrote:
       | When I was a teenager I used to improvise prototypes at home with
       | those generic Meccano sets (small prototypes where the stifness
       | of extrusion frames wasn't needed).
       | 
       | Is there any modern equivalent? If I look for Meccano nowadays it
       | seems to have gone the way of Lego, where you only have
       | prescribed construction sets, haven't found generic parts sets.
       | 
       | Is there any modern equivalent of Meccano for such an
       | application?
        
         | shagie wrote:
         | Are you looking for https://www.fischertechnik.de/en/
         | 
         | Things like https://www.amazon.com/fischertechnik-Creative-Box-
         | Basic-Plu...
         | 
         | And while many of the kits are "you can build this"... the
         | interesting stuff is at
         | https://www.fischertechnik.de/en/simulating - things like
         | Training Factory Industry 4.0 24V with PLC connection board
         | https://www.fischertechnik.de/en/products/simulating/trainin...
        
           | p_l wrote:
           | Looks interesting, but uses way more I/O than I expected :O
        
       | jbay808 wrote:
       | In Japanese hardware stores last year I spotted a new type of
       | aluminum extrusion called "G-fun" by the "SUS" company, which is
       | vastly superior in terms of rigidity and interconnection options:
       | 
       | https://g-fun.jp/
       | 
       | However, I can't find it anywhere in North America.
        
         | jbay808 wrote:
         | (Addendum: If you're wondering what makes it more rigid than
         | traditional X-shape extrusions, it's partly because the joints
         | are well designed, but mostly because the torsional rigidity of
         | a thin-walled section is proportional to the square of the
         | enclosed loop area):
         | 
         | https://ocw.mit.edu/courses/16-20-structural-mechanics-fall-...
        
         | joshe wrote:
         | This might be the US version:
         | 
         | https://leanfactoryamerica.com/brand/green-frame/
         | 
         | The site mentioned "green frame" and googling found this, seems
         | to be a licensor, since they have a brochure with "SUS" on it.
         | 
         | Looks cool, thanks for mentioning it.
        
       | shlubbert wrote:
       | Love these guys and used them multiple times to build small
       | structures. McMaster-Carr (obviously) also has a ton of handy
       | connectors and fasteners: https://www.mcmaster.com/t-slotted-
       | framing/
        
       | phasetransition wrote:
       | If 80/20 is new to you, then you might also be unfamiliar with
       | its steel channeled cousin, Unistrut. https://www.unistrut.us/
       | 
       | Unistrut is used extensively in the US to build support
       | structures for electrical switchgear and process equipment. You
       | can get grades suitable for outdoor and corrosives exposure.
       | 
       | Unistrut is the Kleenex term, there are a number of work-alike /
       | fit-alike systems.
       | 
       | Then for round tube, there is Kee Klamp: https://keesystems.com/
        
         | rambambram wrote:
         | I love the Kee Klamp system (or just 'steigerbuis' as we call
         | it here in NL). I built furniture with it in the past, and also
         | a bicycle caravan (https://www.theredpanther.org).
        
         | thetinguy wrote:
         | Also open builds v-slot is excellent
         | https://openbuildspartstore.com/v-slot-linear-rail-1/
        
         | mturmon wrote:
         | Unistrut ("strut") also has trolleys that roll in the track
         | (1). Very useful for overhead roller systems in a workshop. Be
         | very mindful of fastener clearances if installing one.
         | 
         | I don't have the handheld, portable bandsaw ("portaband") that
         | tradespeople usually use to cut strut, so I use a grinder with
         | a cutoff wheel (noisy) or a sawzall with a metal cutting blade
         | (more civilized).
         | 
         | (1) https://unistrutstore.com/1-58-metal-
         | framing/unistrut-p2750....
        
         | alanbernstein wrote:
         | For lighter duty, there is maker pipe: https://makerpipe.com/.
         | it's nice because the bulk of the system is electrical conduit,
         | which I think is one of the cheapest type of beam/tube
         | available.
        
           | 123pie123 wrote:
           | I like this stuff - thanks for sharing
        
           | cwillu wrote:
           | Hmm, especially handy given how simple emt is to bend (hand
           | tool available from any hardware store that sells emt)
        
             | idiotsecant wrote:
             | There is definitely an art to making accurate bends,
             | especially in more than one plane! I have never had more
             | respect for the conduit work electricians do every day with
             | EMT than when I tried to learn how to do it myself.
        
               | saalweachter wrote:
               | DIY is a great way to learn what you're willing pay
               | someone else to do a job faster and better.
        
               | jchw wrote:
               | Not sure why this is getting downvoted, it's true. I have
               | been going down DIY rabbit holes and learning about a lot
               | of stuff that I wouldn't want to DIY. I always thought
               | that list included "AC/electrical work" but, actually,
               | not really, except maybe the service panel itself. If
               | anything, the work I've done is significantly more likely
               | to be up to (current) code than what was already here...
        
           | phasetransition wrote:
           | Kee Klamp for EMT, cool.
        
           | SECProto wrote:
           | > electrical conduit, which I think is one of the cheapest
           | type of beam/tube available.
           | 
           | There have been pretty serious PVC conduit shortages for the
           | last year or two. In construction projects I've worked on,
           | they've had to uprate to (much more expensive) fibreglass
           | conduit as PVC was simply not available.
        
             | idiotsecant wrote:
             | parent post is not taking about pvc, they're talking about
             | EMT.
        
         | FatActor wrote:
         | Depends on the job. Cutting unistrut is far more challenging
         | than 80/20, it weighs a lot, and the connectors are expensive
         | because they are engineered to bear significant loads. 80/20 is
         | a little pricier per foot but it is much, much easier to work
         | with for applications that don't need to withstand a nuclear
         | strike.
        
           | peteradio wrote:
           | Not sure if the throat is large enough but a portable
           | electric bandsaw would be able to chew through the unistrut
           | steel and in the jobs I've used them on they are precise
           | enough.
        
             | samtho wrote:
             | Portable electric bandsaw is the tool of choice for most
             | electricians who use Unistrut.
        
             | [deleted]
        
             | lazide wrote:
             | An angle grinder with a cutoff wheel similarly has no
             | issues.
             | 
             | It can be a fire/noise/dust hazard, you wouldn't want to do
             | it in a grassy field or server room, but for any
             | construction site it's easy peasy.
        
         | samtho wrote:
         | I used to work in construction and the electrical trade. I've
         | shown so many people the power of this seemingly esoteric item
         | in the electrical aisle at Home Depot. It's so flexible and you
         | disassemble it with one or two tools depending on which
         | fasteners you use.
        
         | jameshart wrote:
         | Another extremely flexible lighter-weight structural tube
         | fitting standard that's widely available is the 1.5" tubing
         | used for drum racks. Not sure if there's a broader standard
         | that the musical instrument industry is building off there.
         | 
         | Was pleasantly surprised recently to find that the same
         | diameter of fittings was used in an adjustable monitor stand,
         | so if you wanted to mount a cowbell above your dual screen
         | mount the fittings are easily combined.
        
         | [deleted]
        
         | zeroping wrote:
         | Good to keep alternatives in mind. I have found unistrut
         | significantly cheaper when you want to build larger scale or
         | stronger stuff. It's not super versatile, but can still do a
         | lot.
        
           | phasetransition wrote:
           | I've used Unistrut and adjacent (flex-craft) more than 80/20.
           | They all have good use cases.
        
         | nimajneb wrote:
         | I just put the metal strut in my Honda Ridgeline truck as rails
         | to attach tie down stuff to. Hopefully it works well for me.
        
           | thecrumb wrote:
           | Got details? I have a ridgeline as well and was curious about
           | doing something like this with a track.
        
             | nimajneb wrote:
             | I bought a 10ft long piece of the strut from Lowes. I
             | bought the slotted type, but I should have gotten the one
             | without slots, the springs on the strut washers get stuck
             | on the slots when sliding them. I cut the strut to length,
             | I think it was 4ft. I bought longer bolts too, I think they
             | are M6 and I bought 1 or 1.25 inches. I bought 1/4 inner
             | diameter 1.5 inch outer diameter washers to attach with the
             | strut nuts. I attached some D rings to those. I can answer
             | more questions if you have them. I drive a 2022 Ridgeline
             | for reference.
        
         | Blackthorn wrote:
         | I knew about 80/20 but this is the first I've heard of
         | unistrut. Thanks.
        
           | lazide wrote:
           | FYI, most hardware stores will have a selection in their
           | electrical aisle, along with basic threaded connections for
           | 1/2", 3/8", and 1/4" bolts, angle connectors, etc.
        
       | londons_explore wrote:
       | I want this, but I don't want to pay much more than the raw
       | aluminium cost.
       | 
       | The cost of pushing aluminium through an extrusion die is nearly
       | zero. The die cost isn't much anymore in the world of cheap CNC
       | machining. And the R&D costs for coming up with the shape
       | shouldn't be high (and already paid off years ago).
       | 
       | So why is that stuff still so expensive??
        
         | simontheowl wrote:
         | By that logic, the lego sets we buy for our kids should also be
         | the cost of plastic ;)
        
         | DoingIsLearning wrote:
         | > So why is that stuff still so expensive??
         | 
         | Bosch Rexroth.
         | 
         | Bosch's extrusion profiles are what people at big co's who need
         | stiffness and don't care about price tag will buy.
         | 
         | My guess is that Bosch warps the whole market up and the
         | competion follows.
        
         | acyou wrote:
         | You used to be able to buy a basic extrusion die in China for
         | $500 and off to the races at $0.80/lbs extrusion cost with
         | 500kg MOQ.
         | 
         | Wonder if there's patent protection on the US sale of that
         | profile?
         | 
         | You still have to cut it, ship it, distribute it, sell it. If
         | you were buying 500 kg, you too could probably find a way to
         | get it cheaply made.
         | 
         | As a counterexample, I will say:
         | 
         | The cost of typing characters on a keyboard is nearly zero. So
         | why is software still so expensive??
        
           | londons_explore wrote:
           | Remember it isn't quite a basic extrusion die because it has
           | a hollow in the middle. I assume that at least requires some
           | fancy 3d shape.
        
           | londons_explore wrote:
           | The patent expired in 2013. (US5429438A)
           | 
           | I wonder if just nobody noticed?
        
             | acyou wrote:
             | I imagine most users are engineers employed by companies.
             | This would tend to decrease the price sensitivity while
             | increasing the desire to go with a brand name.
             | 
             | I see now McMaster-Carr has their own knockoff, they for
             | sure can successfully leverage their reach, reputation and
             | brand recognition to compete. I imagine price must go down
             | once enough people catch on that this is a relatively
             | unprotected commodity and enough reputable players have
             | cross compatible offerings.
             | 
             | https://www.mcmaster.com/products/t-slotted-extrusions
        
         | jvanderbot wrote:
         | Demand. It's ubiquitous. I've seen it in every prototype or
         | mockup or early version of every larger-than-a-breadbox system
         | I've worked on. It's used for lighting, sound systems, camera
         | mounts, even shelving in some cases.
         | 
         | Whenever two or more engineers get together to design
         | something, 80/20 is there in spirit at least.
        
       | andrewdubinsky wrote:
       | Is this just an ad?
        
       | hsnewman wrote:
       | Thanks! I'm going to build a bike cart and although Wize has a
       | kit, I would rather use my design, this info will help greatly!
        
       | furazoball wrote:
       | More modern equivalent to 8020 - https://vention.io - really
       | great way to get started developing an idea!
        
         | mhb wrote:
         | What does _more modern_ mean?
        
       | rjohann wrote:
       | I call it lego for the industry. Many 3d printer frames are made
       | of it. Sim racing rigs are made of it.
        
         | elteto wrote:
         | I call it legos for adults, with the price tag and everything
         | ;)
        
           | sschueller wrote:
           | I would argue that LEGO is more expensive, way more
           | expensive.
        
           | leobg wrote:
           | So what would be a LEGO for adults _without_ the price tag?
        
             | convolvatron wrote:
             | Just bar, sheet, tube and round steel. Still less than
             | $1/lb
        
             | 111111101101 wrote:
             | PVC pipes and fittings.
        
       | maineiac wrote:
       | Signed back in for the first time in... years... to add that a
       | lot of DIY van / overlander builders are using this stuff! I
       | opted for the cheaper but almost-as-good TNutz.com manufacturer
       | for my build. Slightly different alloy but totally valid for my
       | needs. If you're considering building a van, check out Seven-O-
       | Savage on youtube:
       | 
       | How to build a van with 80/20
       | https://www.youtube.com/watch?v=XqiroMdqZ0Y
        
         | harryvederci wrote:
         | _Puts wooden chair in house._
         | 
         | How to build a wooden house!
        
         | jorts wrote:
         | So weird I for the first time ever was looking at 80/20 for
         | overlanding and this ends up on HN.
        
       | techdragon wrote:
       | With all the recommendations flying around, I'd like to seek the
       | collective wisdom's advice, as I've been looking for suppliers
       | anywhere in the world that make these kinds of metal construction
       | framing systems that either make locally in my country or state,
       | or have low bulk shipping to it. I've been trying for ages to
       | find a way to avoid the significant markup to ship these sorts of
       | heavy metal items to Western Australia. I've even been keepin
       | regular tabs on local metal extruders and the few theatres have
       | extruders in state are pretty much entirely making things for the
       | housing/building construction industry and a couple of standard
       | garden/industry forms like tube triangle, square, star picket,
       | etc...
       | 
       | Anyone got advice on good suppliers local or global? I'm happy
       | waiting a month or three for stuff to arrive from anywhere on the
       | globe if it means I don't spend 15-25% on shipping.
        
       | am_lu wrote:
       | For small stuff there is also makerbeam, 10x10mm sized, uses M3
       | fasteners. https://www.makerbeam.com
        
         | techdragon wrote:
         | Unfortunately it's prohibitively expensive for larger
         | "intricate" work projects. Otherwise it's good stuff. Just a
         | little more expensive than I'd like per linear meter.
        
         | [deleted]
        
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