This is not print in place!
the planet gears (2×) need to be inserted in the same orientation without rotation.
use grease (ptfe/teflon)
Ratio is ~11.6 meaning 3 turns for 90° opening.
The Quad version can be used as shoelaces or pull a bracelet or orthotics ( brace or splint ) together. Or for a scissor mechanism to define a distance.
The author remixed this model.