During my study of robotic arms, I embarked on a project that involved utilizing a mechanical arm to inscribe text onto paper. Inspired by the need for efficiency and innovation, I devised a system to automatically change the pen color without manual intervention, thus eliminating the need to physically interact with the mechanical arm. The outcome of this endeavor was highly successful, and I am eager to share my findings with fellow enthusiasts and those interested in advancing this technology further.

Video show how it work :

There are the thing you need :

For Pen Holder

10 x Screw M3*12mm

6 x Screw M4*12mm
6 x Screw M5*12mm

6 x Screw Nut M5

1 x Acrylic for laser cutting 400mm*100mm*3mm/5mm (Thickness up to you)