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Last updated 3 years ago
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All induction proximity probes alter the sensing distance with increased temperature. This might affect the quality of the first printed layer. P.I.N.D.A. v2 probe, included in the MK3S/MK3/MK2.5S/MK2.5, has an embedded thermistor inside its body to measure the temperature and fully compensate for the drift. A pre-calibrated data table is stored in the printer and the temperature calibration is active by default.

Since there is no thermistor in the SuperPINDA, temperature calibration is not available or necessary on the MK3S+ or MK2.5/MK2.5S equipped with the SuperPINDA.

However, it can drift out of calibration over time, and you may also find this calibration helpful when weather and temperatures change in the spring and autumn.

The calibration is fully automatic, but we will lead you through it so you know it went OK.

  1. Start by taking off the Flexible steel sheet.
  2. Navigate the LCD-menu to Calibration -> Temperature calibration. Once selected, the printer will home all axes in order to ensure the correct initial position, and warn you it needs an ambient temperature from 21-26 °C (70 - 80 °F) and a stable surface, then ask if the Steel sheet is on the bed. Make sure it is not on and Select "NO".
If you have just heated the printer, the P.I.N.D.A. sensor will need to cool below 35 °C (95 °F). It will move up and show the state of the cooling on the display.
  1. The extruder will move in over the bed-surface, stop, and with the pinda positioned over the bed, heat up the bed from 75 - 110 °C (167 - 230 °F), across six parts, while checking the readings given by the stationary PI.N.D.A. sensor.

When completed it will move the extruder back to the home-position and give you the message "Temperature calibration is finished and active", and where to turn it off.

Pro tip: You can check temperature-readings from all thermistors on the Original Prusa MK3S/MK3/MK2.5S/MK2.5 from Support -> Temperatures, on the LCD-menu.

This calibration can take 15-20 minutes to go through. The temperature-calibration has to run after a completed XYZ-calibration, and it can be recommended to run PID-calibration beforehand, should you receive any errors, like "Thermal Runaway", when running the calibration.

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