I could not find 3mm ID bearings any where but could find 5mm ID bearings every where! Very common size for RC cars. Moded to hold new bearing as well added pin into design. Uses all same hardware and printed same as original. Bearing size 5mm-10mm-4mm

I should state that I printed the part on its side, just like in the pics shown. I used the same settings as original - in fill- 100% / shell- 1 / temp 230 / speed 80. No raft and no supports. I did drill out the area to fit the M3 bolt but not all the way. I but the bearing in place along with the bearing cover, then slowly ran the brill in. Stopped just as it want to go threw the back.