Bed temperature reading low - ABS lifting

[EagleSeven]

Cheap printer means cheap thermisters. They are not very accurate.

The CTC-bizer does not use 'thermistors' at hot-ends.
It has Thermocouple-wires, which are usually more accurate, over a wider range of temps, than thermistors.

(But temp accuracy is also determined by the circuit on Mobo, not just the sensor)