The bit is too large relative to the design or parts of the design
Check the 3D preview for areas where the bit can't fit.
Click "Generate Detailed Preview" and look to see if the preview shows small or narrow details that won't be carved.
Modify your design by enlarging small details or choosing a smaller bit or a V-bit. With a V-bit, you can carve all details in your design no matter how small they are.
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