Creality K2 Chamber Temperature is Incorrect

Flagship K Series
1

During testing of my retrofit chamber heater, it became obvious that the Chamber Temperature Sensor was not giving a true reading.

https://www.crealitycloud.com/model-detail/creality-k2-k2-combo-chamber-heater

At a reading of 52oC the actual temperature was 60oC

At a reading of 35oC the actual temperature was 40oC

I decided it was probably a miss match of thermistor to the configuration so I decided to do a three-point custom calibration to correct the error.

What I found was the

  1. The sensor is a match for a EPCOS 100K B57560G104F

  2. The sensor is not damaged and is working correctly

  3. There is a bug in the Klipper firmware it is not correctly

Translating the resistance to temperature on pin PC5

What is a mystery is the Klipper firmware is the same for the K2 & K2 Pro. If the K2 pro is suffering the same error it is no wonder people are struggling to reach 60oC as they would actually be trying to get to over 70oC

Creality K2 Chamber Temperature Sensor Three Point Calibration Error.pdf (425 KB)

2

Could Somone check this out on the K2 Pro

It’s easy to do

From cold set the chamber temperature to 50 degrees

Wait until it is up to temperature and stabilised

Revert back with the bed temperature and the chamber temperature

Thanks