A Simple small Puzzle-box with a gravity lock. Unlock by applying centrifugal force. Product tested in "white Strong&Flexible" .
This 3D-Printed Model has interlocking parts and is printed all in one session, no assembly required.
Edit: Updated version of this puzzle-box can be found at: https://www.shapeways.com/product/MWZQ5HSNX/centrifugal-force-puzzlebox-v2-0