Mintemp error and ambient sensor offset  

Mintemp error and ambient sensor offset

Hello,

I have a MK3 that is in an detatched garage so it is used remotely with octoprint. When the temperature drops, I struggle with mimtemp errors. From what I understood, the use of an onboard ambient temp sensor would prevent false trigger due to cold environments. This does not work for me. I am trying to figure out if I am doing something wrong, if my hardware is faulty, or if the FW needs to be improved to do a better job of handling cold environment printing.

Here is an example of what is reported through the terminal;

Recv: ok T:11.3 /0.0 B:10.8 /0.0 T0:11.3 /0.0 @:0 B@:0 P:11.2 A:20.9

As you can see the temp in the garage is around 11C. The extruder, bed and Pinda sensors all agree on this temp reading. The ambient sensor however shows a balmy 21C. My guess is this is why the FW is worried this is a real failure and trips the error. I have read posts that suggest that the ambient sensor used is unreliable at lower temps. Is a 10C offset considered within the norm? If the ambient sensor this imprecise, it seems that a correction offset could be applied based on the reading from the other three sensors.

Is there anything that can be done with the HW or software settings to prevent these errors? On my other printers, I have manually changed the Marlin FW to lower the trip points. When mimtemp trips, it is a fatal error and must be manually reset to allow to print again. This is frustrating when the printer is setup to be run remotely.

Thanks,
Rob