best 3D-printable bearing

by Bribro12, published

best 3D-printable bearing by Bribro12 May 27, 2017


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These bearings are espacially designed for 3D-printing. These bearings don't use regular balls like other bearings but it uses specially designed for 3D-printing balls. This insures the most supple 3D-printable bearings with the least amount of play. The bearing prints in only one piece, fully assembled. You may have to wreck the balls a little lose after it has printed because the tolerances are very small. For the best result you can lubricate it with some grease like WD40 for example. Hope you like it and can use it in your project. (results can depend on printer settings and type of 3D printer used).

dimensions bearings:
small bearing: inner diameter = 12 mm
outer diameter = 40 mm
height = 12 mm

big bearing: inner diameter = 53 mm
outer diameter = 81 mm
height = 12 mm

Print Settings


HE 3D reprap prusa I3









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I was houing this would work - looks very promising, since it uses 'balls' that are better shaped for 3d printing, but I cant unjam it without damaging it ( and myself ). For my printer, models like this need 0.40 tolerance between parts. Ive tried other bearings on Thingiverse and they all seem to have this problem. Maybe its my printer, but always the 'balls' are joined, and when released, there is very rough turning from the bleeding of the plastic at the join.
Ive tried more tolerance and if it prints without being joined, that makes the bearing too loose.
Im gonna try the one that uses BB balls next.

Ok sorry if it doesn’t work out for you, it does for me. Mayby it’s the printer. Good luck with the BB balls.

Have anyone gotten this to work? I even tried lowering my XY setting but it's not even close to working, When finally get it to barely turn the bearings fall sideways jamming everything up.

I have hahaha. I know it's not easy to print but it is possible. I have made a few of them and you do have to wrick the balls lose and turn it a lot to get it to rotate souple. I will make a video soon of my printer printing it and the bearing rotating because a lot of people think it doesn't work but it does. Sorry for the inconvenience.

There's absolutely no need to apologize. I was just curious if it could work.

Ok thank you EsQueue.

Seems that -0.03 was too much XY. -0.02 seems like the sweet spot. How do you break it apart without damaging it. I got it separated but did a little bit of damage. It spins though just need to figure out a less destructive way of getting it free. LOL.


I first go with a knife between the balls and the inner and outer ring and then I gently wrick the balls lose with some pliers. Once I get some movement out of it I just keep moving them until it starts to rotate. Once it rotates I just hold the inner ring and hold the outer ring to a dremmel and that makes it rotate realy souple.

Jul 8, 2017 - Modified Jul 8, 2017

if you printed it and it is blocked try reprinting with the horizontal expansion option set to a negative number like -0.3 or -0.2

I printed and is it blocked

Nice design.
What lubricants could one use for extending the life of this type of thing?

I use WD40 or fine machine oil

i would be smart if you updated the "thing details" with the dimensions of the bearing like inner and outer width.

Otherwise outstanding job!

Thanks for the tip, will do that and thank you!

It looks like it's welded together when slicing with slic3r:


I pressed "Split" button in Slic3r and welds are gone.

Very nice Frol, glad to hear this.

I added pictures of the bearing being sliced and printed

Indeed i can see but I use cura engine to slice it and it is perfect. Will post picture