Barbeto sphere cam drive

have found a photo of this in internet.
This is designed as a 2:1 reducing gear.

easy to print, no support needed.
use pieces of 4mm smooth rods for cam fingers.
I have used pieces of M4 screws. This is not optimum because of the thread in the track.
clean track in the sphere carefully.
Lubrificate with vaseline: track and pinholes.
Glue together the sphere halves. Structure inside the sphere is to prevent ABS warping.
Also, I have a sphere model oscillating 90degree, untested. Tell m