Topic: Does this sound like the power supply?
On my SD2, I tried to crank the hot end temp up to 220, and about 10 seconds after it starts a print, everything stops moving and RH says there was a printer error. If I try 215, it seems to work OK (so far). I've been meaning to wire up a much better power supply I have for a long time now, maybe I should really get around to doing that? :-).
