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This is the second iteration of my Centrifugal Force/Gravity-lock Puzzle-box. It Unlocks by applying centrifugal force.
The item is all printed in one piece and has 6 moving lock pins that retract when closing the lid, and open when centrifugal force is applied. I finally made this thing so that it operates smoothly for both open and closing.
Design by Daniel Liljar
Disclamer: Shapeways do not always manage to remove all of the excess powder. Some manual removal with pressurised air or by rinsing the print in water might be required to remove any excess powder around the locking pins.