I've just had what looks like either a faulty PINDA probe or a callibration memory loss issue.
After some fairly heavy use since I bought it I tried a print first thing of the morning and got a message saying:
Bed leveling failed. Sensor didn’t trigger. Debris on nozzle? Waiting for reset.
I gave Z calibration a try and not only had the two Z motors become misaligned but after moving the hotend to the very top the motors tried to drive it straight into the heated bed, resulting in the same error message.
This surprised me a bit as I understood the point of going to the very top to be as there was a known distance to descend.
Furthermore there is supposed to be a limiter which stops the hotend from descending more than 1mm down from the calibrated point - does this not apply during calibration? Makes sense that it doesn't but...
I disconnected and reconnected the probe connection from the board and thought I'd try a full recalibration - XYZ (with finger hovering over reset in case it tried to puncture the heated bed of course).
This started off great! It found the correct Z level and the first couple of calibration points were found just fine. So fine in fact that I made a cup of tea only to be horrified by the sound of the hot end gouging out a good square inch of the heated bed. (pic attached).
So, my question you all is...
Any idea what's going on? I'd guess faulty PINDA probe - unlikely though it seems - but maybe the board is fried (it has seen some pretty constant use in the last few weeks).
Why did the 1mm-under-the-calibrated-height failsafe not work though? (I did also test this by starting a new, supervised print before the calibration effort with the same result - it was trying to push way more than 1mm below sanity)
Anyone seen anything like this before?
All comments gratefully received!