Arduino Ramps 1.4 and CNC Shield Case with Fan mount v0.9

part of http://www.thingiverse.com/thing:2011708
included http://www.thingiverse.com/thing:34174

box with 120mm fan (slow and quite).
to open on the back,

updated:
backpplate with lock
holes for airflow on backside,
rsdocs included

check the sizes with a testprint before print the whole thing