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Akisame -
Mar 09
  ·  Edited: Mar 09

Anyone else getting thermal runaways??

in Proforge 3 3D Printing

So I'm getting thermal runaway errors when printing a simple temperature tower from 220°C till 180°C using cura's calibration shapes.

Anyone else experiencing the same issues??


My guess is that the firmware currently checks if the hotend temperature is a certain value above the set point and triggers a thermal runaway if it is above that point...Not sure.

I've attached my gcode.


Edit: I can't attach my gcode here so I used pastebin

https://pastebin.com/g1LC8y8K

43 comments
0
Frederik Weis
Mar 09

Do you know where the runaway occurs? Had that on my old Cartesian printer one time because of a broken thermistor and one time due to loose connectors. maybe also do a PID Autotune for the hotend and the bed (but only if you haven’t got the Mic6 upgrade!)


Marlin should also have logs where you pretty surely can see, where the problem occurs. And as always, check your connections if you get a hardware error :)

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Akisame -
Mar 09  ·  Edited: Mar 09

It occurs on layer 4. Fans turn on at layer 3. It only occurs when the temperature goes from high to low. It seems it doesn't occur when the temperature goes from low to high. I will do another PID Autotune once this low to high temperature tower is done.

When the error occurs the printer turns off for a brief second. No logs are available but my sitting next to it just before it occurs I can check the error it gives

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Akisame -
Mar 09  ·  Edited: Mar 09

It seems it is unable to maintain 220°C with the fans on 100% even after (another) PID autotune.... At least at low layer heights. Once it goes up a bit it is fine with it.....This is a bit sucky..

0
Frederik Weis
Mar 10

@Akisame - if you can compile marlin yourself, consider changing the timeout for thermal runaway:


“For false thermal runaways notcaused by a loose temperature sensor, try increasing WATCH_TEMP_PERIOD or decreasing WATCH_TEMP_INCREASE. Heating may be slowed in a cold environment, if a fan is blowing on the heat block, or if the heater has high resistance.“

source: (on point Thermal Protection)

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Johannes Weis
Mar 10

@Akisame - did you pid tune with fans on? Also consider getting a silicone sock for your heater block. Helps tremendously with keeping hotend temperature.

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Akisame -
Mar 10

@Frederik Weis I think this is the best option. Thanks

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Akisame -
Mar 10

I think I figured out why it is always skipping during ABL....You know when it goes by the front about 1 mm away from the front edge of the top section? Well....That top square isn't cut straight. There is a 1 mm deviation across the front causing it to bump into it when doing the front pass throwing the axes out of wack....I'll need to reprint the hotend shroud and include a little thing to allow it to pass by this without bumping into the top section....

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Johannes Weis
Mar 10

@Akisame - have you checked if your carriages and rails are parallel? It's very easy to tilt the gantry 1-2mm when assembling.

I don’t think the square at the top is off since cnc laser cut parts are pretty difficult to fuck up.

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Akisame -
Mar 10