Voice training feedback thing

Yeah it's a bad name but I couldn't think of a better name.
What this is is a hair band that goes around the back of your head with cups that block your hearing to hear sound backwards.
WHY?? I made this to help with vocal training.
How it works. When we talk in a recorder and hear ourselves we sound different because the sound we hear is from part our voice and the other part is our skull and tissue as a resonator. This tight headband presses down around the ears to partially stop us from hearing the resignation in our skull so we can more clearly hear what the voice sounds like to others hearing us.

This is just for practice purposes and not for style. I hope it helps and good luck with voice training.
For safety reasons, use at your own risk. They do block some sound and you might find them disorienting.

Note on printing my infill was gyroid at about 45%. This is to keep this tight to your head but keep it flexible enough to get around the back of your head.
Note you may