As of May 2026, the printer's target temperature is about 10 degrees lower than what the display shows. This affects all printers using the same bed thermistor and firmware calibration, including the MK3.5, MK4, Core One, and Core One L.
The discrepancy means that when you set a bed temperature of 60°C, the actual surface temperature is closer to 50°C. This can cause adhesion issues with materials that require precise bed temperatures, and is particularly problematic for PLA on the Core One L which has a larger bed area.
Impact
- Poor first layer adhesion for temperature-sensitive materials
- Inconsistent print results compared to expected behavior
- Users may compensate by setting higher temperatures, masking the underlying issue
Status
This is a known firmware/calibration issue that has not been addressed as of May 2026.