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What stops the bed and the hotend from overheating?  

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Helmuth
(@helmuth)
Eminent Member
What stops the bed and the hotend from overheating?

Is there a firmware or hardware safety feature that caps temperatures that either the bed or the hotend can reach?

A couple of times, I've made a "fat finger" error with the Octoprint interface when manually preheating the bed prior printing (because it takes so much longer than the hotend) and banged in a 3 digit number, e.g. 950 instead of 95. I have caught this immediately both times and corrected it.

I'm guessing that there has got to be some kind of max set in firmware for hotend and bed temperatures, but does anyone know what they are, and possibly more importantly, what is the response from the printer if the user tries to drive the temperatures beyond these maximums? Is a ramp up in temperatures and then a "MINTEMP" error?

Posted : 21/06/2022 4:06 am
pokon_nurdspace
(@pokon_nurdspace)
Active Member
RE: What stops the bed and the hotend from overheating?

The MAXTEMP error occurs when at least one of the temperature readouts of the hotend is higher than 305 °C. It is a safety feature that prevents the printer from overheating uncontrollably.The MAXTEMP BED relates to the heatbed and appears when the heated bed reaches above 125°C.

source:

https://help.prusa3d.com/article/maxtemp_2167

Posted : 21/06/2022 9:58 am
Helmuth liked
JoanTabb
(@joantabb)
Veteran Member Moderator
RE:

Maxtemp can also indicate a short circuit in the hot end thermistor circuit

Maxtemp bed. Can Indicate a fault in the heatbed thermistor circuit

 

 

 

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 21/06/2022 12:03 pm
jsw
 jsw
(@jsw)
Famed Member
RE: What stops the bed and the hotend from overheating?

I've also had safety timers time out and shut down things when I preheat to ABS temperature and don't come back and either refresh the preheat or start the print within so many minutes.

Posted : 21/06/2022 1:54 pm
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