Locking Adjustable Ratcheting Head Band

I've been having trouble sourcing elastic material for the Prusa Face Shield - so I decided to design my own adjustable head strap that can be 3D printed. One pushes the dial to lock the current setting, pull to unlock and adjust.

Here's a video I made of them in action - https://www.youtube.com/watch?v=wSoVVIoDDiU

V1 has the octagonal dial and I found a few things to improve on it.

V2 has the triangular dial and manages to print faster and more improved that v1. I have plans for a v3 that will do away with the need for the M3x10 bolt + M3 nut.

Print instructions

0.2mm layer height
0.4mm nozzle
3 perimeters
5 top and bottom layers
20% infill