Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Printable Threaded Rod

by PacManFan Jun 16, 2011
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I scaled the nut up 4% and put some paste wax on and it works pretty good. Before that, it was 'get stuck' tight.

Is there any CW/RH equivalent of this available?

Amazing, I printed the 4 start one and after just a little bit of working the nut the rod literally falls through with no effort. Has anyone tried using this as a replacement for threaded rod?

Is there a way to arc an extrusion? Basically I'd like to use this code, but arc the extruded rod somewhat, say by 5 or 10%.

I'm using openscad and trying to modify your code, but so far no luck.

I'm not quite sure what you mean by "Arc the extrusion rod". If the threaded rod had a curve along it's length, I do not believe the nut would be able to twist along it.

If the curve is slight in relation to the thread pitch, and the nut is not too tight, then it'll turn. They use this idea in telescopes - see the "curved rod mount" picture here: http://en.wikipedia.org/wiki/Barn_door_trackerhttp://en.wikipedia.org/wiki/B... and also here's a guy that made some by bending straight bolts: http://www.youtube.com/watch?v=HjEIJ3t4jnIhttp://www.youtube.com/watch?v...

From what I can tell this shape (a curved, threaded rod) isn't possible to create in openscad. However, blender can probably handle it. If you beat me to the solution I'd be grateful if you'd post it. I'm a noob with Blender right now.

This would be awesome to test casting in aluminium. (PLA burns away cleanly...) "Needless to say" in the same lingo, MIND=BLOWN!


Thank you!

I may have to try that. Earlier this year, I attempted to do a casting using ABS in place of the "lost foam". I figured that because ABS has a high degree of styrene, it would vaporize. It didn't work out so well. Only portions of the ABS vaporized, then the aluminum set to quickly to vaporize the rest. I will have to try again with PLA.

I think this will work very well, especially if one could design something that could pack the 'core-mixture' evenly around a talcum powdered PLA piece. Have a look at this: http://reprap.org/wiki/High_Temperature_Metal_Casting#Coreshttp://reprap.org/wiki/High_Te...

myfordboy really knows his stuff!

I printed out the nut and screw, but can't quite wind the latter through the former. Is it possible to carefully gouge out the nut's channels? Would simply sanding the interior help? I'd prefer to keep the printed look on the screw itself

Maybe a light sanding of the threaded rod would help. Initially, the fit was tight for mine as well, after working the nut on the thread for a few minutes, it loosened up to the point where it spun freely on it's own.

What are your plans to deal with wear?

That screw has an insanely high lead angle and I can see things wearing very fast. Any tests under load?

I did some early work on a printed ballscrew, but gave it up as too complex to be worth the trouble

One other way to account for the high angle is to add more tracks. As you know a normal leadscrew has 1 helical. This is printed with 2, I could easily make it 4 to share the shear forces more evenly. 4 might be a good test and would probably be preferable provided that it doesn't add too much friction.

It DOES have a very high lead angle. I may print the nut out of PLA so it doesn't wear as fast, it will slip more. I had also considered dipping the nut in a tough, thin epoxy to "fill" the gaps between the threads. Until I build a threaded-propelled shuttle, I won't know how fast it wears. So far, it seems alright.

PLA and ABS gears together will make the ABS one wear out fast. So that one might not work.

At what layer height are you printing? Looks pretty fine.

The real trick is to match the model up with my known layer height. In the scad file, I use the extrude function with 256 steps, that's exactly the # of layers when the model is sliced at .40mm

Also, any particular reason why it has a left handed thread?

No particular reason

Nice ! Hope your Multirep is going forward :)

Mate, that's amazing! Would you have time to post a video of how easily the nut moves along the threaded rod? VERY COOL!

Video posted.

I'll probably modify my shuttle design from here : http://www.thingiverse.com/thing:9190http://www.thingiverse.com/thi... to incorporate a nut holder. I'm thinking about creating an endstop to hold a motor with some gears to increase the gear ratio.

Printable X/Y Linear Rail