Triple Film Container For 135 (35mm) And 120 Analog Film

I like to take one of my analog cameras with when I'm outside. Since "storage capacity" is not the strong point of film cameras, it is very handy to have one or more rolls of spare film with me. That's why I designed these film cases to hold up to three rolls of film, with latches, so the lid doesn't get lost. To attach the lid to the case, you can use paracord, a key ring, one of those split rings used on camera straps, a carabiner or anything else you can think of that will fit.

I use my case for 35mm film for about a year now, always attached to the zipper of my bag, and the latches have not yet broken. For my case it works wonderfully, I hope it is good for you too!

Design Considerations

• The whole design was created with easy and fast customizability in mind: almost every relevant parameter in the fusion360-file is customizable or scales according to changes.
• For 135 film, an inner height of 49 mm was found to be optimal. 
• With 120 roll film there are two options: one with 69 mm inner height, which fits unpacked rolls (and probably those where the foils seams are on the side, like with Kodak Portra 400, however this is untested) perfectly, for a day of quick shooting. The taller version is 77 mm tall and meant for 120 film that's still in the foil packaging, which can make the roll taller than when it's unpacked. (This is the case with Ilford HP5+ for example, where the foils seams are on the top and bottom)

Possible Further Improvements

• I was thinking about adding a rubber o-ring as gasket, so the lid fits a lot more snugly, making the case weather-resistant and even safely storable in a fridge or freezer. However, this would require thicker walls, to be able to implement a groove in the lip which holds the o-ring in place.
• If I ever find the time and passion, I'll translate the parameter names into English. Until then, I hope the variables are recognizable enough, be it after a short translation using your favorite search engine.

Printing Instructions

I sliced my cases in Ultimaker Cura 5.1 and printed them on an Ender 3 v2. 

I mainly used 100% infill, as it doesn't make much difference, since the only parts where this is relevant are the top and bottom of the complete case. However, some interesting visual outcomes can be achieved by adding an infill pattern when using transparent filament.

No supports are needed, if you feel more confident you can use some for the latch, however. 

For unpacked 120 film rolls I would suggest to print the 120 case in black filament, so the film is shielded from light, when not rolled up light-tight. For 120 film still in the foil packaging, as well as 135 cartridges, I found transparent filament to look really nice. 

Some closing words

Be sure to let me know what you like or don't like about the model and make suggestions for improvement!