Localised test strip maker for darkroom photography

A localised test strip maker for darkroom photography.
It is for 80x60mm test papers (18x24cm cut by thirds). But you can try to scale it during printing.

If you print top white (to see image when positioning) then paint bottom side black to avoid light leaks. Or you can start printing with black and change it to white if your printer support filament change.

EDIT: Added MPPTopScrew.stl and MPPBaseScrew.stl version to be screwed together with small wood screw.

EDIT: Added MPU for pape