Printing went smoothly after two preliminary passes to work out the sizes and alignments; this is the second pass, which you can tell because the mirror shoulder has three supports instead of the two shown in the solid model:
One view of the parts, with the mirror shaft in place:
Another view, showing the bottom of the Elevation Plate with the recessed nut:
Assembling the two glue joints required an overnight clamping:
Then a layer of double-stick foam tape affixes it firmly to the helmet:
It’s a bit too big and way ugly, but works pretty much as expected.
Two lengths of heatshrink tubing now lock the mirror shaft sections in place; they tended to rotate slightly under normal vibration.
The OpenSCAD code and model have a few modifications from this object. The next one won’t have the third section of mirror shaft, which makes the shoulder and Az Mount smaller, and the Az Mount is 1 mm closer to the El Body. That shaves a few millimeters off the whole thing.
The mirror clamp out there on the end is much too large and has too many fiddly parts. I think a little printed doodad would work, but that’s in the nature of fine tuning.
The Smell of Molten Projects in the Morning 
Hi,
What kind of glue did you used for this plastic ?
Great job !
Regards
Pierre
It started out as Plastruct, which is mostly trichloromethane (aka chloroform). I’ve been adding acetone and MEK for long enough that I think the original contents are long gone; I keep it around because the jar has a nice brush in the cap that doesn’t dissolve.
I have a few minor tweaks in the pipeline, but overall the mirrors are working great!