6-DOF Robotic Arm – DIY 3D Print, Wire & Program Guide

Description

6-DOF robotic arm – full project package

This package gives you everything you need to 3D print and program a 6-DOF robotic arm from scratch. You get all the STL files, the Arduino source code, and a wiring diagram.

The arm has 5 rotational axes and a gripper. It runs on MG996R and SG90 servo motors, controlled through an Arduino Uno and a PCA9685 servo driver. I designed the parts in Autodesk Inventor and made sure they print well on any FDM printer.

How it works

The Arduino Uno talks to the PCA9685 over I2C, which gives you 16 PWM channels for controlling servos independently. The base rotation uses an MG996R for the extra torque, while the gripper and wrist joints use lighter SG90 micro servos. Power comes from a separate 5V supply since USB alone can’t handle the current draw from six servos at once.

Each joint has its own 3D-printed bracket and mounting system. The parts snap together with standard M3 screws and nuts. No glue, no modifications. If something breaks, you just reprint that one piece.

Printing tips

I recommend PLA at 0.2 mm layer height with at least 30% infill for the structural parts. The gripper fingers can go down to 20% infill since they don’t carry much load. Print time varies, but expect around 15 to 20 hours total depending on your printer speed.

Who is this for?

If you’re getting started with Arduino robotics and want a hands-on project that actually does something, this is a good place to begin. The code is well commented, and the wiring diagram shows every connection. You don’t need prior experience with servo control or I2C. The tutorial walks through each step from printing to programming.

What’s included

• STL files for every printed part
• Arduino sketch for servo control
• Wiring diagram and full component list

Full tutorial: DIY 6-DOF Robotic Arm: Step-by-Step Guide