When running the wires between sides, you can use the same soldering iron technique we used on the face of the goggles.

I added a fancy four-port socket on the side of one of the eye-cups with a little epoxy.

Which fits a standard four pin plug.

Notice that I've used only three of the connections - so that the socket and plug are polarized.

Connect the ground, power, and data line to a Trinket, Gemma, or Arduino. Our other LED-goggle tutorial has details on how to use a Trinket, with some example code as well

3D printed threads are going to be troublesome. Print on a fine setting with a slow speed and be prepared to do some careful clean-up on the parts to make sure they fit together well.

Use an old leather belt, strap from a purse, or nylon ribbon as a head band for your goggles.

Accessorize with hardware to your hearts content.

Here, I added a port made from one-half of a scrap book page post.