@Kioto :thanks for your observations, flash pictures seem to highlight the various reflects on the plate
I went back to the printer and swapped for a different plate, and a 0.4 nozzle, before trying a printer auto test
the autotest failed with similar code 0300 4000 174717
and next attempt with a slightly different code 0300 4000 174817
full calibration failed too, but with more informative error message about “referincing Z axis failure”
0300d00-020000a-162817
which isn’t forwarded to the HSM , “unknown error + code 03000d00-0002000a-180517”
the last part seems to follow our local time , so is not significant : I’ll edit the threa to remove it
While I was checking the printer Z axis motors, I noticed that one of the bearing (?) seems out of place on the right hand Z guide
compared to the left side
I’ll look in the wiki about refitting the part, it seems that’ll need to take the printer apart ![]()
edit (again) :
several other thread about such errors suggest to check the rear Z axis could be messed up by print residues
I’ll check the easy ones first ![]()






