This is a spray paint can mixer based on a video Adam Savage did a couple years ago. The featured company never made any more. There are DIY versions using hardware store parts but I decided to model it instead. Cheaper and easier to replace. Feel free to cut or alter the dimensions to suit your needs. The default model uses an M8 Bolt, Nut & washer. Optional to glue 1 mm craft foam to the sides to create a more snug fit that also lets you invert the mixer.
Additional Parts needed:
1x M8 Bolt
1x M8 Nut
2x Washers