Novel printing technique enables instant formation of gold nanoparticles within specific regions of 3D printed objects, solving a major manufacturing challenge.

The entire helmet is 3D printed as one piece using a semi-transparent PLA filament with NeoPixel strips ... After everything is finished, glossy gold paint is applied and the polished outcome ...

Filament is the material we use for FDM 3D printing, and it's pretty easy to ... It prints very well and the shimmer from the gold/red highlights hides any layer lines after it has printed.

This explains the special extruder, since metal-bearing filament is hell on typical 3D printer nozzles ... or titanium for $112. Gold was also an option, but at $6,400, we’ll pass.