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MK3S+ hotend problem  

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JRemaud
(@jremaud)
Active Member
MK3S+ hotend problem

After changing the nozzle, the hotend heating cartridge systematically burns out during the calibration test (resistance measured at zero). The calibration goes as far as the bed test, then there is a cut-off without an error message and the machine resets. Measuring the resistance of the cartridge shows that it is burnt out. I measured the other voltages, but everything seems normal.

Opublikowany : 28/10/2023 10:34 am
ronnie12342003
(@ronnie12342003)
Estimable Member
RE: MK3S+ hotend problem

get a new heater cartridge 

Opublikowany : 28/10/2023 11:11 am
JRemaud
(@jremaud)
Active Member
Topic starter answered:
RE: MK3S+ hotend problem

Thank you for this valuable advice, but after having burned two Hotend cartridges, I think the electrical problem lies elsewhere.

I have measured all the tensions that appear normal, and I have no further avenues of research.

A line of research?

Opublikowany : 29/10/2023 10:16 am
ronnie12342003
(@ronnie12342003)
Estimable Member
RE: MK3S+ hotend problem

you did not say you had already killed 2 cartridges so the feed to the cartridge is faulty or you fitted 12 volt in stead of 24volt  

Opublikowany : 29/10/2023 10:20 am
JRemaud
(@jremaud)
Active Member
Topic starter answered:
RE: MK3S+ hotend problem

The cartridges are original PRUSA and the voltages measured are indeed 24v at the power supply and the EINSY box

Opublikowany : 29/10/2023 10:30 am
ronnie12342003
(@ronnie12342003)
Estimable Member
RE: MK3S+ hotend problem

so either the power supply is faulty or the cartridges or wiring is shorting some where ??  

Opublikowany : 29/10/2023 11:53 am
Robin_13
(@robin_13)
Reputable Member
RE: MK3S+ hotend problem

Do you have a volt meter?  Can you measure the voltage going to the heater cartridge from the connector on the Einsy?

A quick experiment I just tried with a spare heater, if the Einsy isn't controlling the heater properly, then the heater will overheat and glow red and then burn out.  Need the heat sink and thermistor connection to regulate properly.  Does the temperature read properly from the hot end thermistor?  If you have a cold printer and grab and hold the hot end, does the temperature go up on the display?   This is a simple temperature test. 

If you have an external thermometer that you can measure with, then slowly manually test the temperature settings and compare the screen to the measured temperature.

After having heating issue, I would be tempted to change the thermistor as it may have gone out of calibration.  I had my head melt and the thermistor gave me one temp but the actual temperature was much higher.

 

Opublikowany : 29/10/2023 9:59 pm
JRemaud
(@jremaud)
Active Member
Topic starter answered:
RE: MK3S+ hotend problem

Thanks for your advices.

I have already carried out all these checks and changed the thermistor, with no conclusive results yet.

I will disassemble the entire circuit and check the wiring, voltages and temperature step by step.

I will keep you informed of the results.

Opublikowany : 30/10/2023 11:05 am
JRemaud
(@jremaud)
Active Member
Topic starter answered:
RE: MK3S+ hotend problem

After total disassembly (including the EINSI) I ended up finding a screw (of unknown origin since I had not opened the EINSI for several months) stuck between two connectors.

I don't understand how the voltages could be correct, but the printer works now.

Thanks for your help.

Opublikowany : 31/10/2023 3:28 pm
Robin_13
(@robin_13)
Reputable Member
RE: MK3S+ hotend problem

Glad you got it working.

A piece of metal on a circuit board.  You are lucky that it didn't take out the board.  It would be interesting to know which connectors it was on.  Also would be interesting on how it got there. 

 

Opublikowany : 31/10/2023 4:21 pm
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