Easy-Install Gopro Scuba Mask Mount with recessed nut and support

This is a remix of jayziggy's awesome original model. I made the following modifications:

* Scaled the original to .001 in Netfabb so that the object would seem to be in mm units rather than µm.

* MeshMixer was then used to add some breakaway supports so that the ends of the strap clip would print better on my single-extruder printer.

* While in Meshmixer it seemed worthwhile to adjust the mount point to add a space for a loosely-captive nut. I found it difficult to get right the size o