I think this has to do with what as found in this post… It seem the
M1005 command does not have an end stop so the printer is trying to go beyond. I would think someone noticed the printers trying to “Bang their head against a wall” and adjust that…
What was recommend was to send …
M1005 I0
then
M500
to save it.
Not sure if this is the same for the A1 mini, but I will try on my A1 and see. I have a newer one and the heatbed start to overheat, and then shut down the job during calibration, this I think one of the lines is getting knock loose during the 21 times, that it slams the Y-axis all the back during Calibration and