Tonight I'm tired. I'm making a box. The box is JinxTheRabbit's Box and Lid from Thingiverse and I cut a hole in the top with Will and Durgan's gear shape script in Tinkercad.
STL file: http://www.geekhaus.com/makerhome/day28_gearbox.stl
Tinkercad link: https://tinkercad.com/things/jv8fVQ1rMgA-day-28-gear-box
Thingiverse link: http://www.thingiverse.com/make:48362
Settings: Afinia 3D software .3mm normal, 54 minutes.