3D printed stylus pen

A capacitive touch screen is made by an array of sensors and is able to identify a contact through the electrical voltage variations. A simple stylus pen works as a conductor and transmits an electrical charge between your finger and the screen. Then a microprocessor detects the electrical changes and estimates the coordinates of the touch. Thus, using a conductive filament is possible to produce functional 3D printed stylus pens for smartphones and tablets. This post is to demonstrate how the stylus tip should be.

Free 3D model of a stylus pen
3D printed mini stylus pen with a conductive filament
Free 3D model of a mini stylus pen
Close up of a 3D printed mini stylus pen with a conductive filament

First of all, the conductive filament should not be too resistive because the signal could be too weak. Also, when the microprocessor receives the contacts and estimates the locations, it is possible to ignore areas thinner than 1/4 inch. This is to avoid unwanted activations and is considered as the size of a human fingertip. As it is illustrated in Figure 3, an angle of 20 to 45 degrees is recommended for the tip, since it needs a flat contact and at this angle is more convenient to hold the stylus and use it. A soft rasp can be used to refine the tip and make a smoother surface. The hole in the middle helps to minimise the area of the contact, it is possible to work without it too.

Free 3D model of a mini stylus pen
Sketch of the stylus tip

Supports or rafts

This part does not need supports or rafts.

Perimeters

Use of three lines perimeter.

Layer Height

High.

Printing speed

Low.

Travel speed

Low.

Download Design: Link

(1x) Conductive filament


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