Roof Coffee Cup

Step 3 Making the mount

To mount the magnets, you could just glue them right to the cup.  But most cups have a recessed bottom, so to get the best sticking power, they need to touch the metal.  I accomplish this by mounting the magnets to a piece of plastic, and gluing the plastic to the bottom of the cup.  In order to get the right size, you need to trace around the bottom of the cup on a piece of plastic.  Cut it out, and trim as necessary to make it just barely slide into the bottom of the cup.  The cups taper, so as long as you get it past the bottom, it will have room to move around and adjust.