Tell us about yourself!
Very Cool!Small recommendation;You might want to substitute the PVC work-coil support/protection with another material. PVC can release some toxic fumes when burned or heated, and our health is important goal for any project! Anything non-ferrous and non-metallic such as a thick glass cup/tumbler might work well.
Stellar Instructable!Makes me wish I had a 3d-printer...Wonder if you could rotate the hemisphere seam 90 degrees from horizontal to be longitudinal. Then it might parallel one of the internal phase dividers to make it a bit more discreete.
... or the winding mech. from a cheapo tape measurer?
What about the rotary complication spring from an old timey clock?