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Printable LM8UU bushing v3

by triffid_hunter, published

Printable LM8UU bushing v3 by triffid_hunter Feb 1, 2012
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License

GNU - GPL
Printable LM8UU bushing v3 by triffid_hunter is licensed under the GNU - GPL license.

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Summary

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.

Instructions

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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oh to add when I first printed them they were a bit tight so I took a pencil wrapped with some fine sand paper and sanded down the ridges a tiny bit at a time until they would slide down by gravity

i have been using them for about 6 months now. on over 200 print sessions, no grease, no oils, and they are awesome!

What's the interior diameter?

Printing at 1.6517x scale in Z to make 38mm length bushings. I did a small test and they seem slip very nicely without any play. Very pleased, hopefully these help quiet down my noisy printer.

update, they absolutely do! The thing is super quiet now, and theres been no change in print quality. Very impressed!

Hopefully these will quiet down my printer. Thankfully I have spare rods to test on so I dont have to go through all the trouble of dis/reassembly just fot thme to not work

Testing on an Anet A8 using PLA with 100% infill and a few dabs of white lithium grease. I had to heat up the shaft of a large philips head screw driver, taking a cigar lighter on the shaft to get the LM8UU bushing v3 to turn and expand a little more for smoother movement. I have some real drylin igus rj4jp-01-08 bearings for comparison. The movement on the real igus rj4jp-01-08 bearings can spin on the rod and slide back and forth with ease, one small finger flick and they should move to the other side. Once I got them heated a little to move better they seem pretty good. I will update in a few weeks after further testing .If I don not make an update ....they're probably working :)

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

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