On 06/04/2021 21:41, John Doe wrote:
Plastic filament won't work for bearings here, because the bearings must move
freely on rods even when twisting pressure is applied.

My main problem is a dire need to make 8 mm bearing seals that actually fit
the 8 mm rod. The silly rubber seals that come with cheap bearings have a gap
wide enough to allow tiny particles into the bearing.

Any ways to make close-fitting but easy sliding bearing shields out of
whatever material?

Thanks.

Design something and print it with TPU filament with an ID a bit smaller
than 8mm, that's assuming your 3D printer can handle flexible filament.