This is a simple support for the neck of your guitar while you have it on the bench for work.
I printed this on a Replicator 2 at the standard (0.02) setting with 10% infill.
I superglued some foam rubber to the bottom and top to prevent slipping and protect the guitar.
This thing is now customizable. You can change the height of the base section, the height of the main support section, and the overall width of the support.