What do you mean by “3D nutcracker”?
Here’s a blog post on one design:
Could you sketch or draw up what you mean?
Carbide Create Pro will load pixel image depth maps or STL files — these are widely available, eBay, Etsy, Thingiverse, &c. There are various designs at:
That said, you don’t strictly need Carbide Create Pro to do 3D, see: