Frontier SP3000 NC 100AY full-border masks

Use 0.08-0.20mm layer height, with 2 walls, 15% infill (typical settings).

Print the main mask body in a black filament to reduce reflections (though in prototyping, my green mask worked fine too).

Use the multi-filament versions only if you have a printer that can print with multiple filaments. Print the side windows in a white filament.

There is a spot underneath to glue a 6mm x 1mm magnet if you want the mask to snap in place like the OEM mask. The mask works fine without it.

If you're paranoid about the mask scratching your film, you can sand the top surfaces of the mask to make them smoother. You can also print at a thinner layer height (0.08mm or 0.12mm) to smooth out the top sloping features.

Since the masks are inside the scanner carrier, and not exposed to the elements or insane amounts of heat, PLA is fine to use, but if you're paranoid, PETG or ABS/ASA would work too.

If your scanner won't calibrate with the 135F borders mask, it could be due to your scanner's sensor being offset to the left/right compared to the mask. You can verify this by checking the 0420 mask positioning menu, and seeing one of the side windows being cut off. If so, you'll need to export your own model from the configurable CAD design here:

https://cad.onshape.com/documents/f2d40cbddbcaed743b5e8773/w/210ba3b9a1313645177fc8b2/e/3c93f6ae7d8f2dda8ae367af

For example, if the 0420 menu shows the mask being too far to the left, set the x offset to +0.2mm, export that model, and print that. You can also fix vertical alignment with the y offset value.