Combination Centre Finder and Depth Gauge

Combination Depth Gauge and Centre finder.
Fits a standard 300mm 12inch steel rule. I also use it to mark the corners of boards I am insetting into a wooden border. It uses a 5mm brass heat insert, inserted from the back so it hs extra material for support. Doesn't need supports and a decent infill makes it a bit more resilient. The 3MF files are for an Anycubic Kobra 2 and 3