Confronted with a nice metal eyeglass case that had lost its original liner, I traced the outline on paper and scanned it:

Unlike the plastic Zenni cases, this one has nice straight edges, so:
- Eyeball a LightBurn rectangle over the traced image
- Round the corners to suit
- Shrink it by a few millimeters to make it fit inside
Then:
- Add a perimeter line offset by the 6 mm required to cover the sides
- Draw a dart in each corner to allow for bending the foam
- Set the perimeter priority to
1so it cuts last - Put the original outline to a tool layer to remind me how to do this the next time around
Which looks like this:

Then Fire The Laser into a sheet of EVA foam:

Stuff it into the case, do another one in brown, and the result looks kinda like it should:

That was easy …