I upgraded my Prusa Mk4s from a kit to the Core One+. It was printing smaller models okay, but when I started to print bigger models with large X-Y movements, the printer would crash hard and reboot. This would happen frequently during a print. This thread on the Prusa forums had the answer: I added an external-tooth washer to one screw on the X motor and scraped the powder coating from under another screw on the Y motor. This grounded the motors and I haven't seen a crash yet. [Core One crash/restart – Hardware, firmware and software help – Prusa3D Forum](https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/core-one-crash-restart/) --- **Relates to**: [[3d printing]], [[Prusa]]