Mine, I'm afraid, is remarkably ugly. It's not just that I can't cut a straight line, it's that I printed out the template on a full-sheet label, and for whatever reason the black toner just didn't fuse properly. So I've got this beaten-to-hell look on a brand-new mask.

The circular area is 208mm in diameter, slightly larger than my aperture, and the slats / bars are 3mm each (since S is 5-6.7mm for me). The entire thing is made out of foam board in a 9.25" square, since my outside diameter is 9.25". I have some vague plan of gluing tabs on the edges to keep it in place.

I didn't see any point in making a circle to match my central obstruction.

- Gus