Reply by OG51

I use blender 3d (free software) and zbrush ($$$) to build my models. I use blender 3d to either render as 2d depth map image or save as .STL’s depending on the specific model.

My hobby cnc uses proprietary software to then convert to its format.

There is a large learning curve in building good 3d models for cnc usage. Just wanted to encourage to stick with it. It was my third attempt at learning the software when it finally clicked. Regardless of software it will take effort and persistence to master it.