I bought the D2 Pro just to find out that I cannot see clearly in them, even though I have good sight.
So I wanted to make some non intrusive way of adding focal length.
Designed it, printed, than added some 1mm foam inside, and in the front.
Some 5 mm foam on the back for my face.
Than I drilled 4 m3 holes in both goggles and the extension.
I also changed the curvature of the face-side to fit better on my face.
If any questions - just ask. Cheers
https://www.thingiverse.com/thing:2539074