Magnetic Cup Holder

My cat often knocks drinks off of our couch side tables with his tail, so I made this cup holder with a magnetic base to keep drinks in place.

The magnet I used is 38x5mm--a cheap "large" button magnet easily found in the craft aisle at Wal-Mart--although anything smaller than that should work too.

If you insert the magnet shortly after the print finishes and the base is still warm, it should stay in without glue once the plastic cools and contracts a bit.