Mechanical Arm – DIY 6-Axis Robotic Arm Kit | Arctos Robotics

Education

What Is a Mechanical Arm?

A mechanical arm — commonly called a robotic arm — is a programmable machine designed to replicate the structure and range of motion of a human arm. It consists of rigid segments linked by motorized joints that rotate across multiple axes, enabling complex, repeatable movements with high precision.

Mechanical arms are used across industrial automation (welding, pick-and-place, assembly), scientific research, medical robotics, 3D printing automation, and — increasingly — DIY maker projects. The key advantage of a robotic mechanical arm over a fixed machine is its dexterity: a 6-axis arm can reach almost any point within its work envelope from almost any angle.

The Arctos mechanical arm is a desktop-scale 6-degree-of-freedom (6-DOF) arm that you build yourself from 3D-printed parts, off-the-shelf hardware, and open-source firmware. With a 600 mm reach and 1 kg payload, it covers the full range of hobby, educational, and light industrial tasks — from robotic 3D printing to AI-vision pick-and-place — at a fraction of industrial robot costs.

Whether you’re a student exploring robotics fundamentals, a maker automating your workshop, or an engineer prototyping automation ideas, the Arctos mechanical arm gives you a real, capable platform to experiment on.

6
DOF
Degrees of freedom — full arm-like dexterity
600
mm Reach
Maximum working radius
1
kg Payload
Effective carrying capacity
168
3D Parts
Fully printable on a standard FDM printer
Why Arctos

Everything a Professional Mechanical Arm Needs

6-Axis Movement

Full rotational freedom across six joints — pitch, yaw, roll, and more — giving your mechanical arm true industrial-grade dexterity in a desktop footprint.

Closed Loop Control

Encoder feedback on every joint ensures precise, repeatable positioning. The v2 closed-loop system eliminates stepper motor drift for reliable automated tasks.

AI Software Included

Arctos Studio ships with AI object recognition, PLC programming, path following, reinforcement learning support, and offline simulation — for free.

100% Open Source

Full CAD files, GRBL firmware, ROS/ROS2 support, and all source code live on GitHub. Modify, improve, and share — the entire community benefits.

Modular & Hackable

Swap grippers, add cameras, mount sensors, or extend axes. The Arctos mechanical arm is designed from the ground up to be modified and expanded.

Active Community

Join 1,200+ builders on Discord. Get help, share mods, find wiring diagrams, and watch build tutorials on the official Arctos YouTube channel.

Pricing

Choose Your Mechanical Arm Kit

From entry-level open-loop to precision closed-loop systems — pick the kit that matches your goals.

Open Loop Kit

From $231 USD
  • 6-axis mechanical arm
  • Stepper motor driven
  • Arduino-compatible firmware
  • Full assembly manual
  • Arctos Studio (free)
  • Community support
View Open Loop Kit
⭐ Most Popular

Closed Loop Kit v2

From $300 USD
  • 6-axis with encoder feedback
  • Precise repeatable positioning
  • MKS servo drivers included
  • Full 3D assembly manual
  • ROS / ROS2 support
  • Arctos Studio Pro trial
View Closed Loop Kit

Printed Parts Kit

Add-on
  • 168 pre-printed PLA parts
  • Ready-to-assemble
  • Two-tone color option
  • Saves 80–100 hrs print time
  • Gripper parts included
  • Pairs with any hardware kit
View Printed Parts Kit

Arctos Studio v3.0

Professional Robot Simulation Software — Free

Every Arctos mechanical arm ships with access to Arctos Studio — industrial-grade robot simulation and control software. Simulate, program, and deploy your arm without touching a line of firmware code.

Digital Twin Technology — Real-time sync between physical arm and 3D simulation with <10ms latency.

AI & Vision Integration — Object recognition, reinforcement learning, depth camera collision avoidance.

PLC Simulation — Program ladder logic and test industrial automation workflows in a safe virtual environment.

Universal Offline Programming — Generate native code for KUKA, ABB, FANUC, UR, Mitsubishi, and more.

Runs anywhere — i5 processor, 4 GB RAM. Even runs on Raspberry Pi for mobile builds.

KUKA ABB FANUC UR Mitsubishi Unitree ROS2

Explore Arctos Studio →
Arctos Studio robot simulation software showing 6-axis mechanical arm
Build Process

How to Build Your Mechanical Arm in 4 Steps

15–25 hours total. Intermediate 3D printing skills required. Full documentation provided.

01

Order Your Kit

Choose open-loop or closed-loop. Source hardware from the full Bill of Materials starting at $231, or order a complete kit directly from Arctos.

02

Print the Parts

Print all 168 PLA components on any standard FDM printer with a 0.4 mm nozzle. Expect 80–100 hours of print time, or buy the pre-printed kit.

03

Assemble & Wire

Follow the interactive 3D assembly manual. Build cycloidal and planetary gearboxes, mount motors, wire electronics, and configure MKS drivers.

04

Flash & Run

Flash the GRBL firmware, calibrate each axis in Arctos Studio, and run your first automated program. Your mechanical arm is live.

FAQ

Frequently Asked Questions About Mechanical Arms

A mechanical arm (or robotic arm) is a programmable machine that replicates human arm motion using motorized joints. Each joint rotates on an axis, and the combination of joints gives the arm its range of movement. Mechanical arms are used in manufacturing, research, 3D printing automation, and DIY robotics projects.
The Arctos mechanical arm has 6 degrees of freedom (6-DOF), matching the dexterity of a human arm. It reaches up to 600 mm and carries a payload of 1 kg — enough for pick-and-place, welding simulation, 3D printing automation, and more.
An open loop mechanical arm uses stepper motors without position feedback — simpler and cheaper, ideal for beginners (~15 hours build time). A closed loop arm adds encoder sensors to each joint, enabling precise, repeatable positioning with error correction — recommended for automation tasks (~20 hours build time).
The Arctos mechanical arm starts at $231 for the hardware kit. Including filament (approximately 4 kg of PLA) and optional accessories, total build cost typically falls between $300 and $500 — making it one of the most affordable 6-axis robotic arms available.
Yes. Arctos Studio is a free robot simulation and control application that supports AI object recognition, PLC programming, path planning, reinforcement learning, and digital twin simulation. A Pro version (€99 lifetime) adds advanced features. The software also supports KUKA, ABB, FANUC, Universal Robots, and other professional arm brands.
You’ll need intermediate 3D printing skills (printing with supports), basic soldering (wire connections), basic electronics (power, ground, signal), and intermediate mechanical assembly patience. No advanced programming knowledge is required for basic operation.
Fully. All CAD files, firmware (GRBL-based), and software source code are available on the Arctos GitHub repository. The arm supports ROS, ROS2, RoboDK, and MATLAB/Simulink. You can fork, modify, and contribute back to the project freely.

Ready to Build Your Mechanical Arm?

Join 1,200+ builders worldwide. Get your kit, print the parts, and have your arm running in a weekend.

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