A Hineman box door is pretty hard to display or utilize without some sort of enclosure. The FreeCad model is parameterized so you can set your own depth, etc. Add some M4 nuts and bolts, and there's your enclosure. Hang it on the wall, and start telling people about how you went to school in New Hampshire.
Word to the wise: Take a photo with the combo on it before you put it together. The first time I assembled this, the door swung shut. Had to take pliers to that build.
Prints fine on my Prusa at 15% infill.
The author marked this model as their own original creation.