This is a stripped back version of http://www.thingiverse.com/thing:128963 (Steampunk Goggles using 52mm Photographic Filters) without the teardrop side cover and without the mounting lugs for the auxiliary lens. The strap openings have been moved back a little to clear the decorative ring.
Print two copies of the eye cup and one copy of the bridge. I printed in PLA on a Replicator using support (essential) and a raft.
The bridge pushes into the outer ring. Make sure you have everything oriented correctly - the bridge pushes in from the back of the ring into the slots just above the midline. There are plenty of pictures to help illustrate this.
The angle between the eyecups can be adjusted to fit by softening the bridge in boiling water (assuming you used PLA).
Like the originals, these are designed to use 52mm photographic filters. If your sizing matches mine, the filters can be carefully screwed into place. There are no threads - you just have to carefully screw the filter in to cut the plastic. You could use hot water to soften the plastic, but I did not find that to be necessary.