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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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  • I assume you're getting a thermal runaway error. Is there any evidence of the printer actually starting into thermal runaway? – Perry Webb May 10 '22 at 19:23
  • Also what is the model of your 3D printer? Your temperatures sound like you're printing PLA. – Perry Webb May 10 '22 at 19:25
  • yes running hatchbox pla black. ender 3 pro is all i know. Yes its a thermal runaway. I have been watching it and seeing the hot end temp drop. – MJH12 May 11 '22 at 00:01
  • i thought a thermal runaway was when things get way too hot? – dandavis May 11 '22 at 22:13

1 Answers1

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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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  • I have changed the thermistor multiple times and definetly not. Im thinking its a G-code issue. – MJH12 May 12 '22 at 11:21
  • How could it be gcode? The gcode just sets the temperature right at the start if you're not doing fancy modifications to it. Have you tried flashing the firmware? I was going to suggest that but unsure what it would do to the warranty status – Kilisi May 12 '22 at 13:35
  • I bought this unopened from a third party. I have not flashed the firmware. I will look into that. I have printed 4 10+ hour prints all beautifully since I started this thread. All at 200/60. so strange that changing the temp down 5 degrees on bed drops the hotend. What do you think about it being a fan issue? Maybe all both bed and hotend fans are firing at the same time? – MJH12 May 12 '22 at 14:02
  • I don't know sorry, but the firmware controls the fans. I have never had a fan issue so have no experience with that. The fact that the issue is intermittent could be a capacitor issue, but thats a board problem. If your board is playing up then you need professional help unless you're an electrician – Kilisi May 12 '22 at 14:08
  • I still think there is something wrong with your heat readings, I have done 2, 3 and 4 day prints that don't have any melting bottom layers at 60 degrees bed – Kilisi May 13 '22 at 08:05
  • Theres really no melting at all. I think im being a perfectionist. – MJH12 May 13 '22 at 10:38
  • Nothing wrong with that at all... good luck printing – Kilisi May 13 '22 at 11:08