The original model of this case was great however, I found it a bit difficult to pull apart when I wanted to take my Backbone out of it. I made a few adjustments using Blender.

Top: I removed the lip that was created for the bottom of the case to fit into and I added holes to fit a 3x2mm magnet. (Hole size: 3.50mm x 2.1mm)

Bottom: I raised the edge that would fit within the top part of the case to level it all out and added holes to fit a 3x2mm magnet. (Hole size: 3.50mm x 2.1mm).