lens holder 52-58 mm w/ 2 straps
adaptation of both of this:
http://www.thingiverse.com/thing:70389
http://www.thingiverse.com/thing:9860
3D Mesh Market
Print Discover adaptation of both of this:
http://www.thingiverse.com/thing:70389
http://www.thingiverse.com/thing:9860