Update 3/10/2016: Check out http://www.thingiverse.com/thing:1406436 for my dual-lens holder.
Also, on this one, I have added the ability to adjust the width of the slot that holds the lens. See "Lens Thickness".
I borrowed very heavily from http://www.thingiverse.com/thing:455601 for these. I wanted something configurable, that I could adjust to fit different visors, IPDs, and lens sizes.
I created a 38mm one for my Note4VR, then discovered that my lenses were actually closer to 40.5mm in diameter, so I made that too.
Then I made a standard 25mm one to fit standard width OpenDive/Diveboard setups.
All with 65mm IPD, which fits me personally.
All of this can be configured with the parameters at the top of the SCAD file.
Note that the Note4VR lens holders are wider than the one for Diveboard.
To get lenses, look for Durovis Dive Lens kits, or else buy bi-convex lenses with a focal length of 4 to 5 cm. When installing in the visor, set them so that they are as far from the screen as their rated focal length.