SummaryThis is to hold an Arduino Pro Micro hidden on the side of a 20x20 extrusion that will hold an RGB led stripe to act as a presentations clock as presented here: http://fightpc.blogspot.com.es/2015/12/presentations-clock.html This thing is created with Onshape and shared publicly as https://cad.onshape.com/documents/6281e2c8892346328d0c8b51/w/b3b130d12b204c1595879016Post-PrintingThere is a hole for the wires from Arduino to led stripe. There is almost another hole than can be punctured to use a M6 bolt to fix the part to the extrusion. There is a thin layer of plastic that will help during the printing process.