Prusa XL 2TH - I'm at my wits' end over the “Extruder not spinning” error  

Prusa XL 2TH - I'm at my wits' end over the “Extruder not spinning” error

I need your help.

On my Prusa XL with two extruder heads from 2025, I’ve been getting more and more “Extruder 2 not spinning” errors since yesterday.

I know now that it’s probably just the Dwarfboard connector. No sooner said than done. I cleaned the contacts gently and carefully with a brass brush, cleaned them with isopropyl alcohol, and made sure the cable wasn’t under tension when reassembling.

Printed for almost 5 hours straight—I was thrilled.

After that, nothing worked anymore. Every print fails during the first two layers with the same error mentioned above. Oddly enough: In between, I noticed that it was printing but not extruding any filament. I flipped up the idler and lo and behold, the stepper motor was standing still and the printer kept running.

I completely disassembled the print head, inspected everything, cleaned it, and reassembled it. I even cleaned the Click Mate connector for the stepper motor on the Dwarfboard and gave it a light brush.

What puzzles me is that if it really is a contact issue, then the connection on both sides must be losing the signal. After all, a pin always has two contact surfaces. It certainly won’t help, but I’ll have to test everything—all 12 cables.

Or should I just do a firmware update instead????