Anet A8 Toothed Idler Pulley for 8mm bearings

thingiverse

So the original design was a problem for me because the original bearings had a skirt sticking out that made the width about 2.5mm wider than original width. I did get it to fit into the holder, but the fit was very tight and the pulley had way too much drag and bed was hard to move. I did not have any 10mm bearings, but I did have a bunch of 8mm bearings from old broken brushless motors, and these are fairly cheap and common for anyone that's into RC or drones. So I made a slight modification to the original to allow for using 8mm bearings and for me this worked out perfectly. The original design would be better if you have a pair of 10mm bearings available, but if you have some old brushless motors or order a bunch of 8mm bearings this will work for you