I have a Lulzbot TAZ 4 and am using Lulzbot Cura for slicing, printing with HIPS.
Yesterday, I tried a print, only for this to happen:
It appears that the printer got most of the way through printing the part, and then for no apparent reason lowered the nozzle into the part (causing it to detach from the bed), raised the nozzle back up, and then to continue trying to print like nothing happened.
I thought maybe the G-code file got corrupted when transferring to the SD card (a single bit-flip could cause exactly this problem). So I generated the G-code again with exactly the same settings, and the same thing happened again but in a slightly different place and a few layers further up the model:
I have previously printed exactly the same model, only mirrored, with the same settings, and did not have this problem. I've never seen anything like this. Does anyone know what is going on?