Ender 3 V2 Nozzle temp too low

Ender Series
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1

Good evening,

Just made an account as I have an issue I need fixing.

I’ve had an Ender 3 V2 for over 2 years, barely used, finally got it running again last week in terms of actual print time and running time it’s probably only run for a week or less.

I’m having “nozzle temp too low” issues, I’m using PLA+ by Esun which I run at 230°C, it ran fine until Wednesday (13th Nov 2024) evening this week, it had just completed a 2 hour print at 230°C no problem, I go to start a 45min print and not even 10% in I’m greeted by a thermal runaway message. After this it refuses to heat up over 185, I’ve sorted this but now it won’t go over 200.

I’ve read up about tightening the thermistor screw, but I can’t find a screwdriver that’ll give me enough torque to tighten it further, I’ve also read up on PID calibration(?) but I have no idea how to carry this out, and I don’t want to go through the trouble of replacing the hot end.

Any advice?

2

Thermistor wires should only just be nipped up, they should not be wound in tight as it may break the very fragile wires meaning you will need a new thermistor (good idea to keep a spare as they do break easily with blob of death etc). I think you may have overtightened it.

3

Just been checking over the printer.

I’ve checked the thermistor wires and they seem to be fine.

I’ve cleaned the hot end.

I figured out PID autotuning.

While cleaning the hot end I had the fan cover off as it was heating, and the thermistor read 215°C, then it tanked when I put the fan back on.

I’ve been running the printer without the silicone cover, might that be an issue?

4

You should have the sock on, stops radiated heat going to the print. Keeps the hot bit hot and the “cold” bit cold.

5

I started looking into that shortly after posting my second comment here, got a few on order and they should arrive tomorrow.

6

I bought a load on Aliexpress for my Ender 5 plus cost pennies. Good to keep spares as the do break down over time. I get about 6-8 months out of them.

7

Got one fitted earlier, running a print now and it seems to have fixed it! Got two spare if this one fails.