A snap-together RepRap? Faster, easier, and RP friendly? I would like to start a discussion about and a movement toward a single fastener design that could inch us closer to a fully repRapable design. The vision, as I see it, is a single, versatile, and modular coupling mechanism that could be copied and pasted throughout the design. Much of the time it takes to build a RepRap is spent twisting bolts with an allen wrench. As we progress to a design that contains more RepRapable parts and less steel bar, we will have the opportunity to embed in them the ability to mate and attach to other parts. Furthermore, a snap-fit design could drastically streamline the whole process of assembling and disassembling a RepRap. Using a top-down approach, here's how I look at it: The coupler could: - Use a traditional beam design, but with some sort of easy-release capability (press here, and the junction releases). An example: [www.coe.uncc.edu] - Use a twisting motion to lock the pieces together. There could be a male and female end, the male end having a bump on the side that locks-in to the female end when twisted. (Think about how a BNC connector works, but in plastic, and without the pesky conductors. [en.wikipedia.org]) One downside of this approach is it seems less scalable to heavy-duty applications. While designs like the cantilever can be used multiple times around the same interface (think two "hooks" per side of a rectangular piece, all removable by squeezing around the circumference), a design that requires a rotating motion could probably only be used once. - Use a ratcheting type motion, like removable cable ties. Perhaps our interfacing components could have male and female cable tie-like ends at the interface, and assembly would be as easy as inserting and pulling. - Use a bag-buckle type interface. This is an extension of the cantilever idea, but with a flatter cantilever. Check out [www.hohm.com] to see what I mean. I personally like this idea, because it seems expandable and push-release-friendly. I am sure there are oodles of other techniques out there. The question is which of them is best suited for the RepRap design? Here's another page for inspiration. The twist-lock seems intriguing. [www.umei.com] P.S. A sister post, [forums.reprap.org], talks about a repRappable design for the diagonal posts. This would be a perfect first-application of our coupler. https://reprap.org/forum/read.php?14,14961,14961#msg-14961 Wed, 07 Oct 2026 15:08:25 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?14,14961,15093#msg-15093 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15093#msg-15093
If you come up with some good ideas in .stl, post them up in this thread and I'll build them using an SLS Machine to give you an idea of how well it would work. SLS is the king of RP'ing Snap fits.

The only condition is you allow me to use the design as samples for our customers. Snap fits are always quite impressive for our sales guys to show off.]]> proto Mechanics Tue, 29 Jul 2008 23:32:26 -0400 https://reprap.org/forum/read.php?14,14961,15045#msg-15045 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15045#msg-15045
Quote

Hey Steve. I like the ratcheting push rivot thing! How are these removed?

If I recall, you can grab and pull hard. The teeth slip before they break. Course, that might not be the case in whatever material we use.

Also, these may be tricky to fabricate well, as they have lots of little overhangs. I guess you could make flat T shaped ones without any difficulty.]]> Ru Mechanics Tue, 29 Jul 2008 04:19:14 -0400 https://reprap.org/forum/read.php?14,14961,15031#msg-15031 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15031#msg-15031 Andromodon Mechanics Mon, 28 Jul 2008 22:55:31 -0400 https://reprap.org/forum/read.php?14,14961,15030#msg-15030 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15030#msg-15030 Andromodon Mechanics Mon, 28 Jul 2008 22:54:10 -0400 https://reprap.org/forum/read.php?14,14961,15021#msg-15021 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15021#msg-15021
I like it, but some kind of casing may need to be devised to keep them from twisting apart - looks like they're good at resisting tensile forces, but not torsional ones.]]> Kyle Corbitt Mechanics Mon, 28 Jul 2008 20:14:38 -0400 https://reprap.org/forum/read.php?14,14961,15010#msg-15010 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15010#msg-15010
[attachment 960 boxrivet.gif]

They're called box rivets, I think. Sort of a ratcheting push rivet.]]> degroof Mechanics Mon, 28 Jul 2008 17:12:47 -0400 https://reprap.org/forum/read.php?14,14961,15003#msg-15003 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,15003#msg-15003 -------------------------------------------------------
> There's always the option of interlocking slots,
> and a little glue to hold it. Not quite as elegant
> but simple and easy

Or, similar to this idea, you could design a standard connection with an opening for a heating element (like a soldering iron or something) such that when you insert the heating element, the pieces melt and weld together, forming a solid joint. This could work for joints that don't need to be disassembled, seeing as the main build materials are thermoplastics.]]> Joshua Merchant Mechanics Mon, 28 Jul 2008 14:52:40 -0400 https://reprap.org/forum/read.php?14,14961,14984#msg-14984 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,14984#msg-14984 greenarrow Mechanics Mon, 28 Jul 2008 04:11:09 -0400 https://reprap.org/forum/read.php?14,14961,14983#msg-14983 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,14983#msg-14983 mimarob Mechanics Mon, 28 Jul 2008 03:48:39 -0400 https://reprap.org/forum/read.php?14,14961,14979#msg-14979 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,14979#msg-14979
Like these...
[www.plasticsfasteners.com]

This would have the benefit of being able to buy them,
and still be one less non-printable part.

They do come apart, though they're a bit harder to
get apart than they are to put in.]]> SnailRacer Mechanics Mon, 28 Jul 2008 02:24:56 -0400 https://reprap.org/forum/read.php?14,14961,14972#msg-14972 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,14972#msg-14972
It should be noted that most (if not all) mechanisms that use rotary motion along the axis of the joint for locking/unlocking won't be portable to rotor shafts, etc. That is, anything that needs to rotate shouldn't be made up of pieces that are locked together in this way, as they could (possibly) come apart.

However, different methods of locking can be combined into one joint to give a more secure part. For example, if you put a pin through a pinhole in that twist-lock [www.umei.com] in such a way as to stop the piece from rotating after locked, then perhaps it would be less likely to unlock itself.

Similarly, other locking methods can be combined together to form a more secure joint. Just a thought.]]> Joshua Merchant Mechanics Sun, 27 Jul 2008 21:46:11 -0400 https://reprap.org/forum/read.php?14,14961,14971#msg-14971 Re: A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,14971#msg-14971
For me, that has already happened as I was collecting most of my parts over Christmas and the specialty nuts and bolts store was closed. I discovered that some of the different sizes are hard to come by at the mega hardware stores.]]> reece.arnott Mechanics Sun, 27 Jul 2008 21:11:18 -0400 https://reprap.org/forum/read.php?14,14961,14961#msg-14961 A snap-together RepRap? Faster, easier, and RP friendly? https://reprap.org/forum/read.php?14,14961,14961#msg-14961
Much of the time it takes to build a RepRap is spent twisting bolts with an allen wrench. As we progress to a design that contains more RepRapable parts and less steel bar, we will have the opportunity to embed in them the ability to mate and attach to other parts. Furthermore, a snap-fit design could drastically streamline the whole process of assembling and disassembling a RepRap.

Using a top-down approach, here's how I look at it:

The coupler could:

- Use a traditional beam design, but with some sort of easy-release capability (press here, and the junction releases). An example: [www.coe.uncc.edu]

- Use a twisting motion to lock the pieces together. There could be a male and female end, the male end having a bump on the side that locks-in to the female end when twisted. (Think about how a BNC connector works, but in plastic, and without the pesky conductors. [en.wikipedia.org]) One downside of this approach is it seems less scalable to heavy-duty applications. While designs like the cantilever can be used multiple times around the same interface (think two "hooks" per side of a rectangular piece, all removable by squeezing around the circumference), a design that requires a rotating motion could probably only be used once.

- Use a ratcheting type motion, like removable cable ties. Perhaps our interfacing components could have male and female cable tie-like ends at the interface, and assembly would be as easy as inserting and pulling.

- Use a bag-buckle type interface. This is an extension of the cantilever idea, but with a flatter cantilever. Check out [www.hohm.com] to see what I mean. I personally like this idea, because it seems expandable and push-release-friendly.

I am sure there are oodles of other techniques out there. The question is which of them is best suited for the RepRap design?

Here's another page for inspiration. The twist-lock seems intriguing.
[www.umei.com]

P.S.
A sister post, [forums.reprap.org], talks about a repRappable design for the diagonal posts. This would be a perfect first-application of our coupler.]]> Andromodon Mechanics Sun, 27 Jul 2008 18:21:40 -0400