Mastercam Tool Library Download: The Ultimate Guide to Free Resources
Download a STEP file of the tool from your supplier's website. Then, in Mastercam, open the Tool Manager (in the Toolpaths tab) and use the right-click context menu to "Create Tool". You can then select the STEP file as the basis for your custom tool.
The absolute best place to download verified tool libraries is the official Mastercam Tech Exchange.
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