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126 film cartridge for 35mm film

by ChrisTorkar Jun 25, 2018
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  1. I suggest that a copy of the original 126 cartridge would work better. That is, with a front portion and a rear portion. The present design is substantially similar to the FAKMATIC design, which doesn't work in most of the better 126 cameras I have. The frame No. aperture could be blocked out for versions when the paper backing is to be eliminated. However, the paper backing may be needed to properly position the film at the film plane.
  2. For use of 35mm film in the suggested revised cartridge design, perhaps the vertical frame could be lowered to block exposure of the 35mm film sprocket holes. I find those objectionable.
  3. The present design could be successfully adapted for the 110 film cartridges where the film cylinders are capped at the end, and further including the side bridge to join the two film cylinder caps.
    My address is WD4AON@ARRL.net

Thanks for the really detailed feedback. A redesign is already on my To-Do list :)

Tried your cartridge with an Kodak Instamatic 500 and ran into some issues:

  1. Cartridge didn't fit into the camera. So i cut (with FreeCAD) a piece out from top of the cartridge.

  2. The door didn't close. So i reworked your design. I built the backside flatter. That worked better but not perfect. Next step was flattening back left and right edges. That worked good.

  3. Now that the fitting is good i realized that the filmtransport sprockets from my camera are at the bottom of the film chamber. They could not engage into the sprockets aof the cartridge. So i copied the top part from the spool turned it and cut an appropriate hole in the bottom of the cartridge. Now i ran in issue No. 4.

  4. I put film in the cartridge and loaded the camera. Film does not advance because there is a pin in the camera which goes into the film sprocket holes and blocks the film advance.

At the moment i have no glue how to solve this. I'm afraid i have to remove the pin from the camera. Plan for the future is to cut a slit on top of the cartridge to set the film speed.


(sorry it took me so long to reply ) Really awesome to heart you put so much effort into reworking my design :) Regarding your issue 4, i had the same issue and was trying different things to try to make it work, but no luck. Only after removing the retention pin it solved the problem. I am really curious how they solved this problem in the comercial available adapter... I really like your plan for future improvement :D

Regards, Chris

Yes, but it seems that the distance of the film plane is not perfect... it still needs some adjustment. I will add some pictures I shot.

Great to see that finally someone took the challange to create an instamatic cassette. Have you tried if the cassette is light tight and the focal length (between the lens and the film) is correct?

I have not really tested the lightproofness, but I think it is more a question of the used material (I only use PLA but I don't have black one). To make it light tight, I have covered the cassette in black electrical tape. Since I did not have an original cassette I am not able to check whether the the lens - film distance is right or not. I'm still waiting for my first film to be developed to see if and how good it worked out.