From FreeCAD Documentation
- CAM ToolBit Library: contains an arbitrary collection of toolbits. The specific tools in a library is entirely up to the user. Possible use cases for libraries:
- A hobbyist user may have only one library for all of the tools they own.
- A library may contain all the tools used for a specific material like aluminum or wood.
- A library may have toolbits for working on specific material.
- A library may hold toolbits from a specific supplier.
- A library may correspond to an automatic tool changer layout.