This is a simple case for Nishida Radio's fantastic Apple IIc/IIc Plus VGA adapter (http://tulip-house.ddo.jp/DIGITAL/A2CVGA/english.html).
It prints without supports, and requires only the following hardware:
Print at any layer height you prefer, but I suggest at least 4 perimeters, to make the screw passages durable.
The author hasn't provided the model origin yet.