FYI, 01.06.03 FW update may have reset the nozzle size

Had two failed prints after installing it last night, which was weird because I'd printed fine on the same plate and same filament only minutes beforehand. So I shrugged and decided to run auto flow calibration (hey, last print was long, maybe this part of the spool sucked up some moisture somewhere). Tried to calibrate, only to be told my nozzle size was invalid. I checked nozzle size on the printer and it had reverted from 0.4 hardened to 0.2 stainless.

A friend who also has two X1Cs had the same issue. Set the nozzle size back to 0.4 on the printer and without changing anything, oh look, print works again.

Could be a coincidence but maybe check your printer settings just in case.