Multitool Color Shaker

This is a paint shaker for a multitool (I've only tested it with Bosch). It works with 18ml paints from Army Painter, AK, and Vallejo. Other brands might also fit, but I haven't tested them.

This is still a prototype and not yet fully developed, so use at your own risk. Only use it in rooms where it's okay if a bit of paint flies around.

I would be very grateful for suggestions for improvement; the rubber band solution isn't really ideal yet.