Work in progress.
A reusable film cartridge for bulk loading 35mm film.
Works with standard spools which means you can reuse you used up spools. I would also advise using some sort of felt material (like the one in normal film cartridges) to block light and protect film from scratches. Also a coat of black spray paint should be applied to prevent reflections and make everything a bit more light tight.
The author marked this model as their own original creation.