This drip tray was designed to match the general design of a 1950's GE Refridgerator. With a couple of high-power magnets glued into the recess in the back, it securely attaches to the fridge. It was made to fit under two faucets, which are ~70mm apart, center-to-center.
In order to make the inside watertight, a thin coat of epoxy can be applied.
After using the pictured print for a while, I found that more of the surface should be mesh to account for shorter faucets. The included files have been adjusted accordingly.