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How to disable safety timer for the heatbed?  

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pauvilreutov
(@pauvilreutov)
New Member
How to disable safety timer for the heatbed?

I want to set my bed temperature to 80 C and leave it on for about 12 hours. How can I do that? I tried just setting the temperature but the safety timer shuts it off after 30 minutes and gives the message "Heating disabled by safety timer". 

Thank you for the help in advance.

Posted : 19/05/2022 3:06 am
Zoltan
(@zoltan)
Moderator
RE: How to disable safety timer for the heatbed?

It is called safety due to reason not to heat the bed while not printing. When you print the safety timer will not switch off the heating.

So start a 12 hours print.

even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.10.1 RC1, MMU2S, no closed box, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.3.4, Prusa Connect Beta

Posted : 19/05/2022 3:50 am
pauvilreutov
(@pauvilreutov)
New Member
Topic starter answered:
RE: How to disable safety timer for the heatbed?

okay, but how can I have the heated bed turned on for 12 hours without printing anything? I know how to make it print stuff. I have been printing stuff for over a year now. I just want it to heat up the bed to 80C and not do anything else. No movement of the bed, no movement of the nozzle. In my research I read that the safety timer shuts off the heated bed after 30 minutes of no activity. Is there a way to use gcode to trick it into thinking it is printing when it is actually not moving?

Posted : 20/05/2022 1:02 am
Zoltan
(@zoltan)
Moderator
RE: How to disable safety timer for the heatbed?

The only way is to change the FW - change it and flash unsigned fw, provided you broke the appendix, which means loss of the warranty. It is built in safety, in normal circumstances not possible to bypass.

even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.10.1 RC1, MMU2S, no closed box, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.3.4, Prusa Connect Beta

Posted : 20/05/2022 6:43 am
Neophyl
(@neophyl)
Famed Member
RE: How to disable safety timer for the heatbed?

No, you have to move it, however you don’t have to move it FAR. Even 0.1mm every 25 minutes would stop the timer kicking in. So move the extruder up 0.1, wait 25 minutes, move it down 0.1mm, wait 25 minutes, repeat as often as needed. 
I do question why you want to cause a fire hazard though. There are much easier ways to warm things up. 

Posted : 20/05/2022 3:30 pm
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