CaptainMerica wrote:I got a few good prints, but my stock power supply that I'm back on has recently decided that it wants to try changing the voltage too. I had a print fail halfway through, it was still traveling the print path but displayed "DEF" on the temps and had given up trying to heat, so the extruder was just grinding away on cold filament. Eventually I figured out that the voltage being sent to the Rambo was only 9v, and when its real temp was unable to get close to its target temp, this would cause the DEF fault (wasn't a temp probe issue).
Applying a screwdriver to the adjustment potentiometer on the PSU, suddenly the fans increased a noticeable amount. Adjusting it to get somewhere between 12-13v was a bit of a challenge, as it would change rather randomly and would jump randomly again when lifting the screwdriver off the potentiometer. I got it set to 12.8v and printed several parts, but here at the end of an overnight print I just heard the fans drop, and it's down to 9v again. I believe the PSU is working fine, but its voltage adjustment potentiometer is flaky and must be jumping around just from the machine shaking during rapid movements. I will try to find a suitable replacement for that - I don't think I need to replace the entire PSU.
With the power off, make a note of how far the pot is turned, then turn it through its travel several times, then put it back to where it was to start with. Then turn on the power and see if it is any better.