Instax wide ground glass cartridge

This is a simple printed instax wide cartridge designed around a Pentax 67 focusing screen from a broken viewfinder I had lying around.

I use it to help with finding infinity and rangefinder calibration for my 110 conversions.

I've included the STEP file so you can modify it to your needs.

Note: The camera door won't be able to close with this cartridge inserted.