Anet A8 Toothed Idler Pulley for 8mm bearings

thingiverse

So the original blueprint was a challenge for me because the original bearings featured an overhang that increased the width by about 2.5 millimeters beyond its intended size. I managed to get it to fit into the cradle, but the fit was extremely snug and the pulley had way too much friction, making the bed incredibly hard to move. Fortunately, I didn't have any 10mm bearings available, but I did possess a collection of 8mm bearings from disassembled brushless motors, which are pretty affordable and widely available for anyone involved in RC or drone activities. As such, I made some minor adjustments to the original plan to accommodate the use of 8mm bearings, and this modification worked out perfectly for me. The original design would be even better if you happen to have a pair of 10mm bearings on hand, but if not, using some old brushless motors or purchasing a bunch of 8mm bearings will serve as a suitable alternative.