Printer reboots on nozzle heat-up
Hi
I've run into a problem. My MK3S reboots as soon as the nozzle starts heating up. (everything else is OK)
This happened after i twisted the nozzle "block" a bit when about to change the nozzle. A short circut maybe? I don't want to mess with it too much as i don't have the enough knowledge. I have a new backup hotend, but was hoping i didn't have to change it. Any tips would be appreciated.
PS: I've checked all of the fuses but no luck.
RE: Printer reboots on nozzle heat-up
You should measure the resistance of the heater cartridge in the heatend. I think it should be around 14 Ohm.
If you don't have a multimeter (you should really get one for your printer) you can pull the top 5 amp fuse and see if the same happens.
I haven't tried that myself, but without the fuse it shouldn't short out and reboot. Ofcourse it will never heat up and print, but it will get you a step closer to figuring out what the problem is.
RE: Printer reboots on nozzle heat-up
I concur. There must be a short. Contact support via chat and will give you steps to confirm it.
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Chuck H
3D Printer Review Blog
RE: Printer reboots on nozzle heat-up
Check that the heater wires are well spaced from the heater block, and not jammed right up against them. And they need to be separated from each other, too.
Use a tooth pick to spread them apart - but careful to not pull them from the cartridge.
RE: Printer reboots on nozzle heat-up
I ended up replacing the hotend as i already had a replacement. This is the third time, i've changed it in two years, so hope this one sticks. Anyway thanks for the replies. I hope Prusa will find a more stable/sturdy solution for future hotends.
RE: Printer reboots on nozzle heat-up
@twisted-zion
When changing nozzles - do not twist the heater block as the Prusa guide says. It will only cause problems.
RE: Printer reboots on nozzle heat-up
Same exact problem here. Think I even saw a spark when tightening the hotend back. Am I really going to have to change the whole hotend!? Thanks for any other solutions.
RE: Printer reboots on nozzle heat-up
If this happens is there a way to fix it?
RE: Printer reboots on nozzle heat-up
Same exact problem here. Think I even saw a spark when tightening the hotend back. Am I really going to have to change the whole hotend!? Thanks for any other solutions.
That depends on what's damaged, you can check thermistor and heater with a multimeter (no need to disassemble just unplug on the einsy): https://help.prusa3d.com/ja/article/multimeter-usage_2117
Just replace what is damaged and power down the printer next time before you touch the hot end with metal tools...
If at first you don't succeed, skydiving is not for you.
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RE: Printer reboots on nozzle heat-up
Thanks! Got it fixed. Was the heater cartridge. Feel like I saw to hold the heat block with a wrench in their own literature. Guess i'll try to find a rubber wrench 🤷♂️
RE: Printer reboots on nozzle heat-up
The trick is to not touch any wires with metal objects. I know, easier said than done.
If you remove the print fan first, you’ll have better access and visibility to the heater block and nozzle next time.
Thanks! Got it fixed. Was the heater cartridge. Feel like I saw to hold the heat block with a wrench in their own literature. Guess i'll try to find a rubber wrench 🤷♂️
Cheers
RE: Printer reboots on nozzle heat-up
The trick is to not touch any wires with metal objects. I know, easier said than done.
It’s either that, or just heat it up, cut the power change the nozzle and then power up again..
If at first you don't succeed, skydiving is not for you.
Find out why this is pinned in the general section!
RE: Printer reboots on nozzle heat-up
I've got the same problem! Except I replaced the entire hotend (new block, heatsink, heater cartridge, and thermistor) and it still shorts. If I remove the F2 fuse, that allows the heating sequence to proceed (obviously without heat). The fuse checks out with a multimeter so it's not that. I'm stumped. What else can I check?