Step 1: 3D Printed Parts
I've attached the files for my most recent version of the hinges to this Instructable, feel free to print them as is or modify them to your liking. I've successfully printed these files using an Objet printer and an Up3D printer, and I'm fairly sure they would work well with anything that can extrude ABS. These files were originally designed using 123D beta 9, but I've since moved them over to Inventor Fusion.
If you do choose to design your own, be sure to consider the following:
- Flexibility of Material - The inner parts need to flex a bit so that they can snap together
- Hinge Pivot Clearance - To provide free movement, the pivot holes in the first half of the hinge need to be a bit larger than the circular pegs on the second half. In this version there is a .01mm gap between the two.
- Spring Size - Inside the hinge there are holes exactly the right diameter and depth for the springs I used. If you are starting from scratch, ensure your springs will fit by finding them first and designing around them.