- It has powered up seemingly OK, but been non-responsive to commands from the dial/button on the LCD. Re-bootoing the printer by switching it off, then on has fixed the problem (sometmes it has taken more than one power cycle). I cannot connect to it via USB.
- It has powered up and responded to the dial, I've connected to it via USB and it responds to motion commands, but not commands to heat. The G code terminal shows nothing and heating commands entered there simply disappear when I hit enter.
- Most problematic: It's powered up, I've started a print and made some random amount of progress, then one or both of the heaters have seemingly switched off while the head keeps moving and the extruder keeps trying to push filament. Eventually the filament solidifies and the extruder can't push it through the nozzle and just grinds away. After some time, the heater switches back on and it starts to extrude again, only since the machine has continued to move, it's extruding layers into thin air and when I come to check, there's a bird's nest on top of a partially finished part.
It's not the power supply since that would totally kill the print. I've run the part files through NetFab and eliminated the possibility of an "open solid" or other geometry problems. I have tried the same part with different slicers and thought I had it fixed, but it did the same thing again.