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4.3.1-RC1 Firmware for Original Prusa MINI/MINI+  

Same Old Shane
Member Admin
4.3.1-RC1 Firmware for Original Prusa MINI/MINI+


  • X-axis error during Wizard fixed
  • Safety timer not activated fixed

This is a bug fix release of the previous version 4.3.0, where two bugs were discovered.

X-axis error during Wizard fixed

We have received a few user reports stating that in rare cases, the initial Wizard or XYZ calibration failed while performing the X-axis check. As a result, the print head with leveling sensor (M.I.N.D.A. / SuperPINDA) remained parked outside the heatbed perimeter and later, when performing Z-axis check, the leveling sensor was unable to trigger the heatbed.

This is now fixed. If the X-axis check fails, the user is informed and the test of the axes is canceled. In such a case please ensure that the print head can move freely along the entire X-axis length and make sure you are following the regular maintenance, see the Handbook for more information.

Safety timer not activated fixed

During internal testing, we have discovered that in some scenarios the Safety timer feature wasn't activated correctly and the printer kept the hotend temperature while waiting for the user to confirm a system dialogue - this is now fixed. All scenarios were tested multiple times to ensure that the trigger of the Safety timer is correct.


Download here;

Please report any bug here:


Shane (AKA FromPrusa)

Posted : 10/02/2021 3:42 pm