The mirroring matches the orientation which one wishes to flip the positive inlay along when rotating it to the recess.
It’s pretty straight-forward — I’m re-creating a slightly modified version of my first inlay:
only with the added inset to make things clearer:
inlay example_v777.c2d (72 KB)
which uses the geometry:
and toolpath settings:
and for the inlay it is:
inlay example — mirrored inlay_v777_6_35_center.c2d (96 KB)
Cutting is going well:
(note that I switched off “Cut Pockets First” above)
Next up is cleaning up the two parts and then the glueup — hopefully it will go as well as the first version.