Heatbed temperature offset?
Is it possible to set a temperature offset for the bed heater? I noticed the bed temperature is almost 10°C cooler than the set temperature. I could of course adjust it in the slicer, but it sounds more like a printer calibration thing to me.
9 Replies
I don't see anything in the klipper docs. Probably the best you could do is adjust your thermistor so it is reading the correct temp
graceful-blue•14mo ago
How would I do that? 😊 But, I'm not actually sure it's a thermistor issue. I've added some heat insulating mat under the bed to improve the heating efficiency, and it might be just that the heat loss on the bed top surface is enough to cause the offset.
I've never done it, but I imagine you have to define a custom thermistor
https://www.klipper3d.org/Config_Reference.html#thermistor
and then use that as the sensor type in your heater_bed section
graceful-blue•14mo ago
I guess I just have to try to control my OCD and adjust the bed temp in the slicer... 🙈
might be able to do some GCODE trickery and have it adjust the bed temp in the machine start gcode?
graceful-blue•14mo ago
That's a good idea!
Let the OCD prevail!
Insulation is not a good thing on this massive print plates. Thing is, because of the insulation, the thermistor sits cosy warm and tells the board to reduce power. but the heat is only between the insulation and the heat-mat. Just remove the insulation and everything should be better
graceful-blue•14mo ago
Yeah, I was kinda assuming that. Never thought about it before. I wonder are there any other issues about it? I think the power required to heat the bed is quite a bit lower than without it, so that's a major benefit, at least.
well, if it doesn't reach the set temperature, it's obvious that it uses less power 😉
Using insulation is only a thing if you have a heatbed with a very low thermal capacity, like the PCB heatbeds of the Prusas.
using the thick aluminium plate AND insulation will give you a very long cooldown time too.