nice model, I modified it for M4 hex nuts (to be pushed in) and made versions from 2, 3, 4, 5, 6, 8 and 10mm. plus i made a parametric file for fusion. (you just need to change the variable Bohrer_DM and got your desired depth-stop).
https://www.printables.com/de/model/567451-depth-stop-for-drill-bits (edited)