PINDA Probe testing

Updated 1 month ago ​by Martin Lexa

Sometimes written as P.I.N.D.A., the PINDA, Prusa Induction Autoleveling probe, is a vital component facilitating the calibration of our printers. There are 2 different versions: the first one, used in MK2/S, MK2.5, and MK2.5S, and then the newer version used on MK3 and MK3S. The difference is that the newer version has an inbuilt thermistor to compensate for the difference in cold and hot measurements.

Testing the PINDA probe

Firstly, we need to check if the PINDA probe works at all. For this test, you need a small and thin metal object (spatula, scissors, pliers). Your printer should also be running on the latest firmware version for your printer model.

  1. Press the knob next to the LCD for 3 sec and turn it to raise the extruder approximately 10 cm above the heatbed.
  2. If you have the firmware version 3.5.3 and later (as you should, unless you have an MK2/S), go to the LCD Menu -> Support -> Sensor info and see the PINDA value
Before firmware version 3.5.3, the PINDA value was in LCD Menu -> Calibration -> Show end stops. If you have an MK2/S, you can find the value there.
  1. Place the metal object (spatula, screwdriver etc.) underneath the PINDA probe. The value should change from 0 to 1, and the red light on top of the probe should turn off.
  2. Move the extruder by hand all along the X-axis and wiggle with the extruder cable bundle. The value should still be 1 as long as there is something metallic under the PINDA.
    1. If the value does not change, make sure that your PINDA probe is connected correctly. Please refer to our MK3 EINSY miniRAMBo electronics wiring or MK2/MK2S miniRAMBo articles.
    2. If the value is 1 but flicks to 0 at some point, the cable may be broken at some point. Please contact us via email or chat.
One of the most frequent issues is an overtightened zip-tie, which causes the PINDA probe cable to fail when it reaches a specific position. Double-check all the zip-ties and make sure they are not too tight.

Testing the PINDA probe readings in PronterFace  

There is another way to check whether or not the PINDA probe works correctly. Please perform the following procedure 3 times. For the sake of consistent measurements, please make sure the tests are done under identical conditions. 

  1. Connect the printer to your computer following the USB and Pronterface guide.
Make sure the nozzle is clean, and the print surface is clear of any obstructions.
  1. Issue a G80 command into the command line. It triggers the mesh bed leveling process.
  2. Once the process is complete, issue a G81 command which gives you a report of the interpolated Z values for a 7 x 7 array of values.

Compare the data arrays. Keep in mind that every number in the matrix has their pre-defined positions, always compare the numbers in the same position. You want to make sure there are no significant deviations (>0.2) between the 3 measurements.

After adjusting the PINDA probe or any other hardware, we recommend to run the Calibration Wizzard from the beginning.

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Find out more troubleshooting tips here: Community Forum | Assembly Manuals | Youtube channel | info@prusa3d.com


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