Summary The calibration on a new printer is finally at the point of testing real objects. This design was made by just measuring out some nuts, screws, and a bearing that were laying around. This will be used to estimate a fudge-factor for sizes in the future. Screw holes for M3, M4, and M5. Hex nut holes for M3 and M5. A square nut hole for M5. Screw head holes for M3, M4, and M5. An outer diameter hole for a 608Z bearing. An inner diameter column for a 608Z bearing.