This is a very simple box, printable with the A1 mini in about one hour.
Use it to review your analog nagatives.

A smartphone is used as lightsource, simply open a browser and type in the address “about:blank” to see a completely even white background.

If you want to change the size, open the included fusion 360 file, all sizes are set as user parameters.
you'll also find the 120 roll film version in the files (6x7).

Enjoy, leave a like & comment if you want to,
it's highly appreciated as this is my first upload.

Cheers,
Stefan