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MK3S hotend and replacement not heating up?  

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Stephanius
(@stephanius)
New Member
MK3S hotend and replacement not heating up?

My MK3S stopped in mid-print a couple of days ago. There was no error message shown.
The hotend fuse and the other two fuses are good, the board outputs 24V on the hotend-connector.
I assumed that the time of the hotend had come and ordered a replacment assembly from the Prusa Shop.

With the replacement hooked up, the behaviour unfortunately did not change.
The board reports the target temperature reached, while the hot-end doesn't significantly heat up (see picture above)
The heatbed does heat up as intended.

I'd be grateful for any tips you can give me. Thank you.

 

 

Best Answer by Stephanius:

Thank you! I didn't know that years after purchase support would be available like that.

The helpful support team member pointed out a flaw in my data - using an IR-thermometer on the hotend isn't reliable due to reflection.
With the false reading data discarded, support identified the real fault: https://help.prusa3d.com/article/clogged-nozzle-hotend-mk3s-mk2-5s_2008

I partially disassembled the printing head, removed the hotend assembly and confirmed the fault.
I installed the brand-new hotend-assembly (which I ordered assuming mine was bad).
The printer is now ready for printing again and extrudes fine. =]

I also removed the clog from the used hotend and cleaned the whole thing to put aside as spare parts.

Posted : 28/09/2022 12:16 pm
cwbullet
(@cwbullet)
RE: MK3S hotend and replacement not heating up?

Contact support via Chat on the storefront.  They will help you.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 28/09/2022 2:53 pm
Stephanius
(@stephanius)
New Member
Topic starter answered:
RE:

Thank you! I didn't know that years after purchase support would be available like that.

The helpful support team member pointed out a flaw in my data - using an IR-thermometer on the hotend isn't reliable due to reflection.
With the false reading data discarded, support identified the real fault: https://help.prusa3d.com/article/clogged-nozzle-hotend-mk3s-mk2-5s_2008

I partially disassembled the printing head, removed the hotend assembly and confirmed the fault.
I installed the brand-new hotend-assembly (which I ordered assuming mine was bad).
The printer is now ready for printing again and extrudes fine. =]

I also removed the clog from the used hotend and cleaned the whole thing to put aside as spare parts.

This post was modified 2 months ago by Stephanius
Posted : 28/09/2022 8:58 pm
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