Case for RepRapDiscount Smart Controller

This is remix of http://www.thingiverse.com/thing:28767 and http://www.thingiverse.com/thing:54024
Brackets are suitable for 30x30 aluminum extruded profile (3030).

Changes:
* removed hole for buzzer
* removed hole for kill button
* customized knob

BoM:
4x M3x16
4x M3x8
8x M3 nut