This is a simple 3D printed platter to hold the Adafruit Trinket, a power jack, and a wire strain relief. The STL file as well as the OpenSCAD source are available. Although this design has a 90-degree corner, that corner has a lot of strain-relief. The outside edges have quarter-circles. The inside corner edge is rounded, not sharp. More information at the blog post: http://netninja.com/2013/11/16/introducing-the-trinket-platter/ OpenSCAD source is committed to the GitHub project page: https://github.com/BrianEnigma/trinket-platterPrint it as-is. You probably want a more dense infill than your printer default. Hardware you will have to supply: