Just got my Mini two days ago and have been loving it. However I started noticing some odd behavior last night, and it has been continuing today.
Intermittently (I think I might be starting to figure out what may be triggering it, but I’ll save that for later), the nozzle will crash hard onto the first washer during the auto-leveling process. When this occurs the head will move over to the washer after the wiping process and start the fast descent. Normally it will transition into a slow descent before making contact, but in this case it will just keep on going and crash into the washer with enough force to deflect the bed down by approximately 1/8". The head will then come back up, and the rest of the auto-leveling process seems to complete nominally. On one occasion I observed the nozzle crashing onto the second and third washer as well. Once this behavior starts it is persistent until the printer is power cycled and Cura restarted.
The nozzle is generally visually clean of any material when this occurs. Even if the nozzle had contaminates on it I don’t think electrical contact problems are the issue. This conclusion is based on the fact that the head doesn’t transition from the fast descent into the slow descent.
It seems like this behavior occurs after a failed print (angel hair followed by a ‘Cancel’ in the control dialog), and if the Mini has been sitting idle for 3-4 hours.
Any ideas / suggestions? The amount of force that the head must be exerting onto the bed is a bit troubling…