Mobius holder for ZMR250 frame

It's a holder with protection for Mobius action camera.
v2 version can have some darkness on the edges.
v3 was printed successfully and tested. ( http://shpws.me/EtCG )
v3.1 has a little bit higher walls.
v4 like 3.1 but with more higher walls
v5 it's a compromise between v3 and v4.

Please post a comments which one you like more, and what do you improve in this design.
I'll start to sell it soon on shapeways and from my local store.