Camera film holder

I have a Pentax K1000 camera but don't have a bag to hold film and usually end up trying to hold it in my pockets. I came up with this so that I can change the film quickly.

The strap feeds right through and doesn't get in the way too much when taking pictures.

There is one stl file for cameras with thin (1 cm) straps and another stl file for cameras with thicker (4 cm) straps.