This is a hinged enclosure for Sparkfun's Tiny AVR Programmer.
The hinge uses a 1/16" inch metal rod at its center.
The circuit board is inserted through the left side of the enclosure and snaps into place to prevent it from sliding back out.

https://www.sparkfun.com/products/11460

Use the "Top" and "Bottom" files for printing.
This model was created with Inventor Fusion and was sucessfully printed on an UP!3D printer. The holes in the hinge were reamed with a 1/16" drill bit, and a brass rod was inserted to hold the top and bottom of the enclosure together.