New to 3d printing, my ender 3 is having problems with thermal runaway and doesn't seem to be able to keep a consistent temperature when I begin printing.

It however does not have issues maintaining the temperature when it’s not actually printing. I can set my hotend to 215 before beggining my print and it’s happy to sit there.

Other problems with it include under extrusion and extruder skipping, as it seems to have troubles pushing the filament out.

What does this sound like it could be? Does it sound like a blockage? Could a blockage cause temperature issues? I have already tried turning off the part cooling fan as I had a similar issue with that a while back but that has no made a difference it seems.

atest123,

That looks like a failing thermistor or heater cartridge. You might want to swap out both the thermistor and the heater cartridge at the same time. Had something similar happen to me and it turned out the failure of the one, likely influenced the other to wear out prematurely. The cartridge wasn’t exactly broken, but seemed to have a less consistent response curve. You can test them separately, but they are cheap enough that it is not worth the hassle

Inamin, (edited )
@Inamin@kbin.social avatar

Have you isolated the 5v line on the USB between printer and octopi? How does it go when printing direct of the printer?

histy,

I have the same printer, when I bought it I couldn’t print for shit and what occasionally came out had horrible quality, over/under extrusion, clogged nozzle I was thinking I was the biggest idiot on the planet. After a while it started to occasionally give thermal runaway in the middle of printing. Then one day I decided to disassemble the nozzle because it had clogged and I realized that the thermistor had broken one of the legs but it is making contact because of the screw, I replaced the thermistor and my problems ended. Your description sounds a lot like the problems I had.

rambos,

Most likely this

DrakeRichards,

You say that the temperature is fine when it’s not printing. Have you tried turning on the part cooling fan when it’s not printing to see if that is affecting the hotend?

Sol33t303,

I have, and sadly it did not seem to make a difference as far as I could see.

LazaroFilm,
@LazaroFilm@lemmy.world avatar

That’s usually a bad thermistor or thermistor autre breaking.

Sol33t303,

Hmm I hadn’t considered that the reading could be wrong, I’ll pull apart my hotend later today to have a look at it.

It’s a pretty new printer though, I’d be surprised if I have managed to wear down the wire yet, but still I’ll have a look.

empireOfLove,
@empireOfLove@lemmy.one avatar

Check the entire thermistor cable as well as the plug connections for tightness. Preheat the hotend and then wiggle/bend the cable 1 inch at a time all the way back to the main board plug checking to ensure the recorded temp remains constant. (You can also do this with an accurate multimeter checking resistance across the unplugged thermistor if you don’t want the printer on while poking around.)

Those aggressive jumps sure look like a thermistor problem, but only when printing in motion, which screams bad cable/connection. Manufacturing errors happen.

squaresinger, (edited )

Does your Ender 3 still have the screwed-on-cable type of thermistor? These ones break when overtightened, which can happen at the factory.

If the cable and thermistor is turns out to be fine, run a PID tuning.

zipsglacier,

I had a similar problem caused by loose thermistor wiring, similar to what other people here are suggesting. I used an extra zip tie to secure the wire so it doesn’t wiggle during printing, and the issue was fixed for me.

morbidcactus,

Luck of the draw, could be bad out of the gate, my prusa mk3 had the exact same thing happen less than a month after running it. If you can, add a pinned connection, makes swapping thermistors super easy as a lot of places sell cartridges with microfit connectors.

When I had it happen it wasn’t always a problem, was only on certain movements and then it’d error on thermal runaway. I’d say change it anyhow as it’s simple to do and you eliminate a cause, best to start with the easy things.

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