Klipper & Pinda probe issues - Prutsium/3D-Druckerplausch-Klipper GitHub Wiki
With transforming multiple Prusa printers to Klipper we have noticed issues with the Pinda probe (v1 & v2) but the SuperPinda is not affected.
It seems the Pinda gives very unreliable results during multiple probes at one point and the numbers have a too large deviation to work with. Prusa has made modifications for this in their Firmware to coop with it but also they use temperature compensation (what also would be possible with klipper. Even compensating temperature did not bring the measurements to a small deviation.
This brought us to the idea to use a SuperPinda but this one is made from "Unobtanium" and seems to be sold out for a long time and thus we needed to look at an alternative. It's known that the Superpinda has been made by Pepperl & Fuchs and prusa has their own part-number and Pepperl & Fuchs wont sell you this sensor. Prusa claims they did special things with the sensor but we found the sensor related to it this would be the NBN3-8GS35-E1-PUR.
Thanks to CR3D we managed to get one and could make a good comparison between the Pepperl & Fuchs one and the original SuperPinda the results where quite surprising as they performed exactly the same and also had the same influence from magnets.
To test this we used a 50x50 mesh (2500 measure points) of the heatbed from the Prusa to see if we could detect the magnets.
This is the result of the SuperPinda sensor:
And this is the result of the Pepperl & Fuchs probe:
The bed is not shown as a flat bed due the many samples.
You see clearly the magnets in the heated bed what tells that both are affected by Magnetic interferance. We also ran 100 samples at a single point with bot probes and both performed the same with a deviation of 0.0111mm
With Prusa Firmware you require a probe that is normal closed but within Klipper this doesn't matter as the sensor pin can be easy reversed by using an !
Pepperl & Fuchs doesn't sell to end clients but the people from CR3D have this sensor and if you want this one just ask them for a NO or NC version. Also the 50mm version is no issue is this would fit anyway. You would need the probe with 8mm Diameter.