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I am new to 3D printing and having a strange issue I don't understand and would love some help with. I have an Ender 3 Pro and when I use the settings 200 °C & 60 °C it prints fine. However, I want to change the bed to 55 °C as the bottom layers are melting a bit. I changed this in Cura to 200 °C & 55 °C and get a thermal runaway after 20 minutes or so. I hit resume and the same thing after about 20 minutes, however, the times vary.

I did a PID using the same set temps 200 °C & 55 °C and still thermal runaway. So I changed all the numbers back to 200 °C & 60 °C and ran a PID on this original temps and ran perfect (except for the first layers melting a bit)

The odd part is the bed temp holds fine when adjusted to 55 °C, it's the hot end that starts to drop a few degrees (5 degrees) which triggers the runaway. Is this a fan issue (currently at 100%)? Before I started changing things I wanted to ask here.

Looking forward to your feedback. BTW I am able to change the PID right on the machine and have no experience altering G-code or the knowledge but am willing to try?

agarza
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MJH12
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2 Answers2

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Sounds like a thermostat problem, 60 degrees shouldn't be melting the first layers with PLA.

I would try manually checking the temperatures and move forwards from whatever results I got from that.

If the heats were fine, then I'd be inclined to return it as a faulty unit if it's under warranty.

Kilisi
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Could be a bad thermistor, could just need a pid tune. I would start with pid tuning it, if that doesn’t work I would swap it for a new one. Don’t forget to pid tune the new one if you end up going that route.

durbanpoisonpew
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