The file 'Flatbed Scanner 35mm Film Holder For Curly Films 3D Printer Model' is (stl) file type, size is 12.5KB.
Summary
The upper and bellow side have places to clue small 10x4x1mm -:- 20x5x2mm neodium magnets (4 $ for 10-:-30 pcs pack from Aliexpress China) to keep frames parts tight (that gives tighting strength up to 2kg)
The 3rd part is eventually to place the both parts as a constructions on rails to copy with digital camera for DSLR (e.g. like https://www.thingiverse.com/thing:4498865 or https://www.thingiverse.com/thing:6668683 )
Should fit into budget 3D-printers with 22x22 cm table by diagonal setting.
From original author's thoughts:
Curly negatives can't be properly scanned as they bend in the film holder of the scanner.
You might flatten them but that's a painful process...
Printing two of these and replacing the frames of the bundled film holder will push the films down enough (notice the bit between two frames of the film!) to remove the bend, so you can scan them.
This means that you have to put in the film so the bend is upwards - so you might have to flip the photo after scanning to get the direction right.
I suggest to print this in black so no light is reflected, and using ABS might be the best in case your scanner gets too warm...
down-side-2-flat_scanner_35mm_film_holder.stl | 43.6KB | |
Epson4490-ruler-1-flat_scanner_35mm_film_holder.stl | 8.2KB | |
up-side-2-flat_scanner_35mm_film_holder.stl | 45.6KB |