Unfortunately, all rod bearings suitable for RC servos I found here are completely useless, so I decided to make one by myslef. It took 2 minutes to draw and 20 minutes to print two versions.
This is a print-in-place micro bearing, mostly suitable for M3 screws.
It will be tested soon in our manufacturing device.
Every PETG will do the trick
Optimized for default MK3 settings for "Prusa PETG"