Printable LM8UU bushing v3

by triffid_hunter, published

Printable LM8UU bushing v3 by triffid_hunter Feb 1, 2012
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Printable LM8UU bushing v3 by triffid_hunter is licensed under the GNU - GPL license.

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This is my 3rd version of printable LM8UU bushings.

Prusa suggested to me that putting some spring/give in them could be a good idea, so I gave it a go.

They're more than strong enough to handle the forces they get subjected to, and as an added bonus they're far less likely to crack your X-ends when you insert them since they'll happily compress a little.

I replaced a set of my original bushings with these, they're still wearing in but seem to work great so far. It certainly solved the chatter problem I had!

PLEASE NOTE: ABS is not a suitable material for bushings. It's too soft so it has lots of friction and wears quickly. These printed in ABS would be a novelty only, not a useful part.

PLA works well, as will any other hard plastics.


Open the scad file, enter values from your slicer particularly extrusion width.

render, slice and print!

You should print at least 4 at a time if not more, especially if you have a high perimeter feedrate (this model is 100% perimeters, no infill at all!).

cooling will be required.

Once printed, you may need to run them up and down your threaded rod a little so they're not so stiff.

Use suitable grease.

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I am planning on using PETG, that material feels more slick than PLA does.

I am testing with PLA and it sticks a lot while not moving. I think Nylon would be better

how does the twist inside it effect it?

spreads wear around the entire circumference of the rod.. that's the theory anyway.

It also makes then stiffer

works very well - thank you!

I can't get this to slice properly. I get 48577 Layers..

slic3r taking forever to generate perimeters :D

Do you lubricate these bearings? What do you use for that?

What grease would be 'suitable' for this?

Sliding Barrings??? I would say Nylon for durability Strength and easy motion.

I just printed a set and will begin the testing on my next (in a couple of hours) tear down. I will let you know how they work out. 

Soo... I'm assuming that since ABS is too soft, you recommend PLA? Might as well just say it. :-p

I probably should, but I don't want to preclude use of things like polycarbonate which is also quite hard and may work well