Comfort mod for Pimax modular headstrap

Back piece

Piece for the back of the head that would rest against the head more evenly and wouldn't move around so much when looking straight up or down. This has adjusted area, radiuses and hinge positioning. The idea was to try and leverage the instability of the back hinge to keep the headstrap in place. The original Pimax headstrap tended to slip up on me. Use the original top strap to balance against the hinge rotation pull.

The -5 version moves the hinge position 5mm lower along the curve.

V2: Incresed and adjusted shape surface. Fixed radius labels. Increased radius of for the curve around the Y axis. Adjusted the back hinge angle to be more balanced by moving the center of the Y curve up 10mm.

HMD hinge

The hinge mod allows the headstrap rotate further down around the horizontal axis, ~15 degrees.

The -5mm variation of the hinge mod moves the headstrap rotation axis 5mm lower.

V2: Thicker shaft, more volume where possible. L/R labels.