Nice Idea! Many calibration models are avaiable out in the field like that: Video (thanks to Thomas Sanladerer): Bed Leveling (EN): https://www.youtube.com/watch?v=ED1Gxvw2Rmw (DE): https://www.youtube.com/watch?v=qzvfg-IOQEs (Parts): https://www.youmagine.com/designs/bed-leveling-tramming-paralleli...