Given a 3D design:
which one wants to cut out of 1.4" thick stock:
One would:
File | Export PNG
so as to get the pixel image, then import it into a suitable piece of geometry:
Adjusting the settings until one arrives at the desired result.
Then apply 3D toolpaths:
Adjusting settings for the tooling and so forth to match the cutting capabilities and until one arrives at a desired result:
