Idea is that of the pencil sharpener.

For operational reasons, the project has evolved into a pencil with a scroll wheel.
Simply because of the effort required to maintain the pencil without the set back.

With a wheel, you can press the mechanism and turn at the same time.
This prevents the pencil sharpener from falling back when the pencil is pressed to be cut.

This mechanism requires a simple pencil sharpener that is positioned in a receptacle (the blade side opening).
The one used for mounting measures 16x11x26 mm (0.62x0.43x1.02 inches).

Model for pencils 8 mm in diameter.

pencil shaperner

http://amzn.eu/d/4OHDoVS

Code EAN 3457708511524

spacing:
-gear and body 0.2 mm on diameter and 0.1 mm in supports.
-pinion and pinion support 0.1 mm on the axis.
-the rails have 0.05 mm with the body and pinion support.

Nomenclature and assembly steps are detailed on the images.

have fun
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Extruder: 200 ° C and bed: 55 ° C

Layer height: 0.2 mm

Vertical shells, perimeter: 3

Horizontal shells, solid layer top: 3 and bottom: 3

Fill density: 20%.

no support

Speed perimeters: 40 mm / s