Marble Lock
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The marble lock is an interior privacy lock that requires a marble to be inserted before opening. Once the door has been opened, turning the knob back releases the marble. Watch it in action at: http://imgur.com/gallery/Ct49X This design utilizes 12 Airsoft pellets as bearings and can be enhanced with an optional 45mm tension spring if the return on your existing door knob is too loose. A 16.5mm marble is also needed. The base features a print-in-place swivel joint, making it essential to keep bed temperature low and avoid over-extrusion in the first layer. Enjoy The Marble Lock by Beta Things!
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