Back in late 2012, Chris designed and printed a solution to one of his largest pet peeves–a wobbly cafe or bar table. The beauty is in its simplicity. Combining a simple wedge with an integrated clip so that the wedge can easily pop off your key ring and be used to make your table stable.
Read more here at http://www.3dgeni.us/six-of-the-best-key-chain-accessories/
Or download the “Wobbly Table Wedge” on Thingiverse.com: http://www.thingiverse.com/thing:32289