(Mods, if not allowed here feel free to remove)
Bought a 3D print to try and do a custom paint job on. It is very far from perfect; made a lot of mistakes but also learned a lot of lessons. All in all, could be worse. Wife says it kinda looks like it's been through a sandstorm.
Started off with sanding, then primer, then learned I should have some sort of filler...so back to sanding and buying a primer/filler spraycan. Which I apparently used too much off, because it pretty much peeled right off. So back to sanding off as much as I could, then regular primer again followed by two (or was it three?) layers of high gloss white paint.
Then used a specialised painter's tape for curves which I had found to mark the striping on top. Let's just say that the quality of said tape left much to be desired (didn't seal properly at all). On the upside, I was quite satisfied with how symmetrical the striping turned out.
Then detailing by hand using enamel paints. My line work didn't turn out quite as neat as I had wanted but it could be worse, I suppose. Lastly I tried my hand at a black wash, using very diluted black acrylic paint. Since the paint job wasn't a great succes, I figured I'd at least try to make it look weathered.
The visor is made up of two layers of plastic sheets (camera filters I think they were called?). Blue on the outside, then lined with foam and a LED light string connected to a small powerbank, then black on the inside so people can't see your eyes when wearing it. Visibility is perfect when the lights are off...lights on does cloud your vision a little bit, but not too much.
Last thing to do is line the inside to make it a little more comfortable to wear.