I decided to put together a simple magnetic dash tray for the dash of my bug. I put 10mm x 4mm rare earth magnets into the little indents on the back. You don't need to fill all of them, I found that mine works just fine with 3 or 4, but I opted to use more for stability.
There are two versions of this tray... One with a slot for a can of snuff (because I wanted one, and maybe someone else will too :) ), and one without.
No supports needed, just print it and go.