A favourite of CNC enthusiasts is to 3D carve and a ball nose router bit allows you to do just that. These are a great entry level bits as the are value for money compared to tapered ball nose. The radius = 1/2 of the diameter with no flat bottom. These bits can also be used to engrave lettering.
- Plastics (ABS, acrylic, HPDE etc.)
- Wood (MDF, hardwood)
- Wood (Ply & softwoods)
Cutting against the grain reduces fuzzy material forming in your carve. This can be set in your 3D carving software under the term "raster".