The Mmintbox is my design for an enclosure for an Arduino with an LCD keypad shield. These are the files for my latest prototype. It was the subject of an unsuccessful Indiegogo campaign to make an injection-molded version.
EDIT 2014-08-01: Added the Solidworks 2013 source files, as well as STEP files for each configuration. CC-BY-SA, so have at it! If you make molded ones, send me some, k?
EDIT 2016-04-22: Per user suggestions from davidcyr2000 and bathrobotics, I have enlarged the USB and power cutouts, added a knock-out window to the right side of the box, and separated the box and lid STLs. I also added an STL of the box without the built-in supports for those who don't require them.