PrintrBase - ATX Power Supply Base for PrintrBot Simple Metal

Two part case to hold an ATX power supply for a PrintrBot Simple Metal with Heated Bed.
This can be printed by the PrintrBot Simple Metal - each piece just barely fits in the 150x150x150 build envelope.
I had to modify my ATX power supply case so that the wires exited the ATX case from the end rather than the side opposite the power connector, since there is not much room between the wall of the case and the back of the ATX supply.
A ridge on the top of the base keeps the PrintrBot fro