The latest product from the depths of the Carbide 3D R&D lab is MC Etcher, a diamond drag engraver. Here's an overview of how it works, and which one to get.

Note: New MC Etchers feature a new spring that provides more linear, progressive force. The set screw may need to be adjusted by several rotations instead of just a fraction of a turn.

https://shop.carbide3d.com/collection...