The Auto Levelling Probe subassembly fucntion similarly to a retractable ball point pen.

Parts are located in a bag labelled ZT-KIT-00127, located inside the "Kossel Common Core Component Kit".

Although the probe was first introduced on the Kossel Pro, it should work well for Cartesian printers as well for probing bed height and setting the first layer.

Prior to the start of a print, the probe deploys and triggers a Z-Min end stop. In the deployed position, the probe is lower than the print nozzle, thus allowing the end effector to sense the position of the print bed.

Touches to the probe are registered through the Z-Min end stop

When the probing is finished, pressing down on the probe locks it into the retracted state.