That requires work other than pressing print and forgetting about it. haha. Sanding I'm ok with. I don't like the tape method. I'm just printing a test block with 15.9, 16.0, 16.1, 16.2 and 16.3 diameter holes in it. Actually Waldo's file above fit the bearings perfectly anyway.. Just got the bearings today. I need to modify the x carriage though so I want a perfect fit with no fuss for that. EDIT: Finished my test block. Magenta Esun PETG ( I finally opened it ) I think i'm going to go with 16 or 16.1 diameter for my setup. I can actually fit it in the 15.9 hole but I dont like having to hammer it in. 16 is tight. 16.1 is tight but may move eventually. I'll probably go with 16. Waldo what size hole did you use on the Y Axis block?