This gravity knife has been designed as a toy to relieve stress and anxiety. Unlike other designs, emphasis has been placed on the ease of opening and closing so that the user can operate it with one hand.
On the other hand, components have been designed so that no additional parts are needed to complete the assembly. Particularly the rotating axis was contemplated as a 1.75mm filament segment and must be cut from the used filament.
In the future, this design will be provided with various interchangeable components such as blades and handles, so that the desired model can be downloaded at will.

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