Reusable 35mm film cartridge

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.