Are there any specific 3D Scanners that work best with STEPCRAFT, or any other CNC?
Honestly, No. Most 3D scanners are capable of generating and saving files in common 3D file format. That is really all that is required for STEPCRAFT. The resolution will vary, though, from scanner to scanner and typically the more expensive they are, the better the scan resolution:
Here is a good article with a list of the top 11 3D scanners for 2017: https://pinshape.com/blog/the-11-best-3d-scanners-on-the-market/