In this video, I build a fully functional multi-color 3D printed pen plotter with an automatic pen changer! No manual pen switching needed — the machine picks pens on its own and draws beautiful artwork. br br 🔧 Powered by Arduino, stepper motors, and a smart tool holder mechanism. All parts are 3D printed and open-source. br br 🎨 Features: br br Multi-color drawing with automatic pen change br br G-code controlled via GRBL br br Custom pen holder using servo br Compact and fully DIY-friendly design br br Whether you're into robotics, 3D printing, or just love CNC art — this project is for you! br br 💬 Let me know if you want the STL files, firmware setup, or G-code examples.