Universal Joint

This is a u-joint I designed to be used with MR63ZZ miniature ball bearings.

(ID 3mm, OD 6mm, W 2.5mm; https://www.aliexpress.com/item/Low-speed-bearings-MR63-Z-MR63ZZ-L-630ZZ-WA673ZZA-3x6x2-5-mm-helicopter-model-car-available/32749270077.html?spm=a2g0s.9042311.0.0.2Pwu8N)

The latest problem with my machine is friction wear due to shafts misalignment. Hopefully this u-joint will fix that. I hope it may also help you!