Chisel is a little script I wrote for making chisel-like marks on a mesh, but it can be used to create other effects. I thought I’d share it in case anyone else finds it useful:
I used to make this type of effect manually using the Rip-Fill operator or the knife tool but that got tedious so I made an interactive tool for it. Behind the scenes it simply bevels the selection and then collapses the geometry at each loose end.
I’m not super experienced with Blender coding so my apologies if the script breaks - be sure to save your work!