I saw a video from Adam Savage talking about a spray paint can shaker and I thought this was genius. I designed one for my needs
I uploaded two models, one with a 2mm offset that shakes the can laterally but I don't think this is needed, so I also included the no_offset file
These are for the standard 67mm can should you need a different size please let me know and I will upload it for you
You will need a M10 x 35mm (or longer) bolt
I printed mine in PETG but PLA will do nicely