Hotend Extruder Not Heating at Expected Rate

General Discussion
1

Basic Information:

Printer Model: Rook 2020
MCU / Printerboard: skr mini e3 v3
Host / SBC : raspberry pi zero w
klippy.log

Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there

Describe your issue:

Has anyone encountered this issue and fixed it?

IMG_2935
IMG_29351170×2532 195 KB

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2

Hi @explorer

That error indicates that the extruder is trying to heat up, and the thermistor isn’t showing a temperature increase. The shutdown is thermal runaway protection.

Please upload the klippy.log as requested.

1 Like
3

Thanks for quick reply. Attache is the klippy.log
klippy.log (138.5 KB)

4

Thanks for providing the klippy.log. The log indicates that the printer attempted to heat for nearly a full minute with no temperature change.

I would recommend a few things:

Be extra safe when trying these. If your printer starts smoking or smelling funny, remove power immediately.

  • Check your configuration to ensure your heater pins, thermistor pins, and thermistor type are accurate

  • Use a piece of PLA to see if the hotend actually heats when it’s commanded to. The PLA should melt.

    If it does, turn off the printer immediately to stop heating

  • Ensure your thermistor works by applying heat to the print head by a heat gun. The temperature should increase.

This should help to narrow down the issue.

5

Thanks. Will try heat gun. Im using a CHC - (ceramic heating core) though and thermistor is inside it. Also, the hotend does not even heat up. I checked the wire connectivity via tester and is ok. Im suspecting that the mosfet of the hotend might have been broken. With this, is using the heatbed terminal to the hotend an option that can be tried? Im using skr mini e3 v3

6

Great! So the issue is mostly narrowed down to the heater.

I’m not an electrical expert, so unfortunately I can’t advise about that.

7

There shouldn’t be a problem doing that.

Make sure that you change your printer.cfg so that the hotend thermistor as the heated bed temperature sensor (you don’t need to rewire the thermistors, they’re there and ready to be used).

I recommend that you only set a temperature of 50C to test the heated bed driver.