Z axis calibration seems to be changing mid print
This afternoon I left my new MK4 upgrade running unsupervised and returned a few hours later to find a rat's nest of filament piled high on the print bed, on the table and on the floor. My first thought was poor bed adhesion so I cleaned the bed thoroughly and cleaned up the mess. Then, just for fun, I recalibrated the z axis, re-sliced the model for a fresh file, and started the print once again. After watching for an hour without any problem I left it running unattended. When I came back an hour later the print was only slightly farther along than when I had left it, but somewhere along the way the nozzle bumped the print, knocked it over, and made a spaghetti mess all over the bed. I've used the same file five times in a row with no issues, but after the first little problem it hasn't worked at all. Any suggestions or solutions?