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Started printing this filament shrinkage test and had to leave the house. When I came back, the whole upper half of the part had shifted after the first few layers, and it left two solid blobs attached and one ball of spaghetti. The magnetic bed doesn't appear to have moved. Part is still solidly adhered to the print bed. How did this happen, and how can I keep it from happening again?
You say you cleaned the nozzle, did you do a cold pull? Sounds like a potential clog.
Not entirely sure what "cold pull" means. I unscrewed the nozzle while the machine was powered off and the hot end was room temperature. Blasted the living hell out of the nozzle with a small torch, scrubbed it inside and out with a brass bristle brush, ran one of the bristles through the end of the nozzle. With the nozzle and ptfe out, I heated the hot end to 60 C to loosen the remaining chunk of filament and pushed it out the bottom with the handle of a needle file. It came out in one solid piece. Shined a light through both hot end and nozzle individually and it looked clear.
Did you hot tighten the nozzle while putting it back? Don't think it caused your current failure, but cold tightening can lead to more clogs in the future.
I think layer shifts can be caused by many different things, but the first thing I'd check is that the bed carriage can move freely and there isn't something mechanically blocking it, like a wire or a misplaced screwdriver. The second thing I'd check would be the belt and gears, so that the bed can't move without the stepper motor also spinning.
I hadn't heard of tightening the nozzle while hot, but I'll definitely give that a try
Thermal expansion is real. Have experienced loose nozzles when only cold tightened. Also as others have said, ensure belts are tight. If they're floppy enough to skip teeth on the steppers you'll definitely get layer shift from a light breeze. Monitor the next test and let us know how it goes!