I made a few changes to a caliper design from MAQUINA. I added a number scale, a slide stop screw, and extended the scale. The model is chamfered in such a way that once the stringing is cleaned up, everything slides together nicely using the generic petg profile and an extrusion factor of 0.95 to stop the scale from getting smooshed. 0.4mm nozzle 0.15mm layer height. Please note that printing all 3 parts together will increase the layer time and the m8 threads on the screw will print better!