V-MiniON bed heater - strange behavior
This behavior started happening a few days ago.
Heating bed to target temperature is flawless.
As long as NOT printing, the heater PWM is stable, no jumps, everything is fine.
A few minutes after actual print starts, bed heater PWM starts going all over the place, as well as reported bed temperature. This doesn't happen immediately, but roughly 6 to 8 minutes AFTER printing starts.
At first I suspected wiring, something coming loose, etc, but after triple-checking wiring, I am positive it's not the cause.
No idea what else should I check.
None of the following: (software updates, configuration changes, hardware changes, printer position changes, slicer updates, profile changes). The only thing that I am doing with it is print.
4 Replies
the temperature looks stable though?
It varies a lot more than before, it was 0.1-0.2 variation, now it's up to 2 degrees up and down
All clues lead me to a wiring issue, but if so, it's somewhere within the heater itself, or within the bed thermistor itself. And that is a difficult thing to troubleshoot.
I think I fixed it, but donțt ask me what the cause was.
What I did was unclip the bed wires from their areas which held them in place (under the bed, as well as everywhere else) and clipped them back.
My suspicion is the wires somehow becoming taut which led to intermittent connection issues. PWM variations back to normal now.
