After some 20--30 minutes the printer just stopped. The nozzle was not moving. Display showed only info about remaining time.
I tried to pause and restart the job -- nothing happened.
After cancelling, the printer didn't drowe any axis. eventually it displayed error ER16, which is for Z-axis limiting.
I drowe the axis manually and could hear the "click" nicely and clear.
Just to be sure I cleaned and lubricated z-axis. 2 days later the same error.
Any ideas how to search for the reason of this error?
best regards
UM3 with firmware 5.2.16.202000331
XY motion stress-test - OK
bed level sensor performance - OK
switches - OK