×Read this message from Erik, founder of YouMagine

Lars' Ultimaker Bearing Retainer

Ditch those annoying wooden bearing retainers and the nightmare of trying to get an M3 nut in place!

3D printer parts and enhancements

Creative Commons Attribution Share Alike

Commercial use is allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.

Learn more or download attribution tags


Pretty straightforward. Replace the stock pieces with these.

Built in M3 nut retainers mean you only have to hold this assembly in place to get the first bolt started, then rotate into position for the second. Super easy compared to the alternative.

They also allow for installation without having to remove an 8mm shaft. This is very helpful if you've ever forgotten to install the retainer when putting shafts back in! 

You can just use some small snips to cut the old ones out if you don't need to remove the shafts for some other reason.



Issues are used to track todos, bugs or requests. To get started, you could create an issue.


4071aadf9e64689e01550152066f21de?default=blank&size=40finerdesign added this to the UMO Upgrade collection ago
B1bdd12eb13152b4c559fb9c929bf259?default=blank&size=40fcristy28 added this to the Ultimaker UMO collection ago
96c2f4f604a3d3b0b968a9d52f46d57e?default=blank&size=40mbartell added this to the umo+ collection ago
Mini pasfoto3Jhan added this to the printer parts collection ago
Dd77c744b68ef5117b4b33b707e419ba?default=blank&size=40Oleg Dutko added this to the printer parts collection ago
3ce8201028c7b9d4acdcb449ecea3445?default=blank&size=40CCS86 published this design ago