It allows continuous measurements since it returns to the 0 mm point. Different holes were designed for possible future needs and two pointed diameters to lengthen the measurement point.

A support for the printer is pending, for the leveling / calibration of the bed, with the possibility of automating.

The spring recovered from a damaged printer, and the metallic extension of the floppy drive

If you need to take the measurements and store them or connect to a microcontroller like arduino you have the connector in this link
https://www.thingiverse.com/thing:4348889