Born as a personal project, this helmet for markerless facial motion capture is available as an open-source collaborative design project.
I am actually finishing the prototype and preparing the aluminum (or maybe resin) casting for the final product.

Helmet

The ergonomic structure of the helmet has several protrusions that stiffen the parts and allow to reduce vibrations. Some of the protrusions also serve as cable holders allowing perfect wiring of the helmet. The result is a sturdy sci-fi looking structure.

Action cam

The helmet can host any action cam measuring 59.5x25x41.2mm (WxDxH).
I recommend using a wireless camera so you can stream the video directly and start-stop recording using another device such as a mobile phone.

LED strip

The helmet uses a led strip as a light source for illuminating the actor’s face. The led strip must have a width of 9.75mm to fit in the front ring channel.
I recommend a 5V led strip because it can be powered using a standard (wearable) powerbank. The actual model has a wider straight area on top of the front ring to make room for the remote IR controller of the led strip.

STL download

You can download the .stl files and 3d print the helmet structure (you might have to adjust the size according to your head dimensions).

Updates

I’m finishing the prototype of the structure, finding new lightweight solutions and creating the cutting pattern of the upholstery.
All the updates are on my Behance page.