Printer Restart when extruder heating up
Problem: My printer will restart itself when I start a printer and it begins heating up. It will home Y X and Z, then when it hits the preheat step it restarts. BUT If I preheat the extruder before starting the print it will work. At first I thought it was just drawing too much power at once, but I can start the bed and extruder from cold in a preheat macro and it doesn't shut off. It'll only do it if I start a print without preheating the extruder first.
Context: I just modified my vchonk 180mm to a 250mm build volume. I only made changes to printer.cfg to change the build volume and z tilt.
What I've tried: Ive check all my wire connections and they are good, I thought It was related to the hotend but I've bought a brand new one and it still has the same problem.
Not sure where to go from here. I don't think it's hardware since I can print still, but hopefully someone else knows. Maybe it's from the patchwork editing I had to do to make a 250mm vchonk work.
9 Replies
what restarts, the pi?
I'm not sure, Mainsail freezes, fans go 100%, I get this message, then 30 seconds later everything is like I turned it on fresh. So I assume the Pi?
yeah, sounds like the raspi then. No error message when it comes back up?
I'll try and go through the klippy.log in a bit, but thats hella strange
no error when it boots back up, just the standard welcome to RatOS message
Update: If I try to heat the extruder after homing, it will restart the printer(not just in the start print macro)
If there is no error message, that really sounds like a failing power supply or similar.
I'll swap it out tomorrow and fingers crossed thats all it is
I put a brand new power supply in and no luck 🙁 same problem
SO weird
You were on the right track, it was power supply related. (I upgraded to a 350w and everything works great) When I expanded my vchonk I upgrade from the 160mm (180w) heater to a 235mm (200w) heater. it looks like that 20w difference was enough to push it over the edge. My guess is that the hold current for the motors AND THEN heating was enough to spike it over the threshold, thus triggering a shutoff. Thanks a ton for your help!
Aha! That's great to hear you solved it. Glad also that my hunch was right 😝