Mechanical pencil

this is a mechanical pencil for 2 mm leads. It has a shape so simple to be printed quickly with low cost 3D printers. After being printed just to follow the instructions you find in the picture attached. This is a first working version, but still to be processed so that it is much more durable and efficient.

(My goal is to design useful objects for humans, without the redundancy that creates disposable items, which destroy the Earth)