If you are looking at Cut3D to enable 3D work then it might be better to look at upgrading from Cut2D to Vcarve since it has integrated support for Design & Make 3D files and STL files. It can handle 2 sided machining as well.
If you specifically need 4 sided machining then Cut3D would be your only solution.
- Randall Newcomb
10 fingers in, 10 fingers out - another good day in the shop