Preheat resets power  

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imhavoc
(@imhavoc)
Active Member

Suddenly, when I set the printer to preheat, it turns on the heaters, starts to raise the print head and power cycles. The search terms are so general, that I'm having difficulty finding existing documentation.

 

thanks.

Posted : 04/12/2020 4:51 am
imhavoc
(@imhavoc)
Active Member

Okay, a little more testing shows that it power cycles when the bed heater turns on. Can someone point me to the documentation I'm looking for?

Posted : 04/12/2020 5:04 am
imhavoc
(@imhavoc)
Active Member

Further testing showed that it only power cycled with the textured sheet installed. I had noticed what appears to be exposed copper close to the 50mm mark on the heated bed at the very front of the heated bed months ago - almost immediately after assembly. Recently, a spot of exposed copper has appeared near the 200mm mark at the very front of the heated bed. I covered them with electrical tape and installed the textured sheet, and the problem seems to have been resolved. Now, I've created a terrible bed leveling problem.

Am I going to have to replace the heated bed?

Posted : 04/12/2020 5:21 am
khlae
(@khlae)
New Member

I would plan/expect to replace your heat bed if I were you.

Unless you could find some kind of thin insulator like paint or  kapton tape precisely cut and fitted? ensuring a flat build surface is gonna be quite hard if you're adding any material thicker than the insulation on a PCB or overlapping the remaining  insulation.

Posted : 04/12/2020 11:09 pm
Area51
(@area51)
Prominent Member

Kapton tape would properly be the best as it is made for electrical insulation and heat. It is difficult to get the right thickness when using paint as insulator.

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 05/12/2020 3:22 am
Mike Gann
(@mike-gann)
Active Member

@imhavoc

Use a good quality of clear fingernail polish.  It is a great electrical insulator.  Brush it on thin, one or two coats, and you will be good to go.  It will self level.  I did this on my MK3S heat bed to fix a nozzle scrape.

Mike Gann

This post was modified 4 months ago 2 times by Mike Gann
Posted : 06/12/2020 1:13 am
imhavoc
(@imhavoc)
Active Member
Thanks, @Mike Gan!
Posted : 06/12/2020 3:34 am
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