Mostly utility stuff around the house. At one point, a custom chicken coop. My use case is unlike commercial/industrial. It serves as an 'infinite jig', a work bench and a platform for experimenting. I can see driving it with Klipper. Mach3/gcode is like batch mainframe work. Klipper/Python could make for a much more interactive experience. eg. vision for work piece alignment and then be able to say "give me a 1/2" dado down the back with system 32 shelf pins.