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Build Thor, a 3D-printable 6-axis arm under €350: media published by AngelLM/Thor
Demo video on YouTube (opens in a new tab)Credit: AngelLM/Thor
Build Thor, a 3D-printable 6-axis arm under €350: media published by AngelLM/Thor (image 2)
Build Thor, a 3D-printable 6-axis arm under €350: media published by AngelLM/Thor (image 3)

Build Thor, a 3D-printable 6-axis arm under €350

Arm, Hard

Thor is an open-source, 3D-printable 6-DOF robot arm with stepper motors and an Arduino-class controller, under €350 in hardware.

View build on GitHub ↗Share on X

Print the parts, wire the steppers, and control it with Asgard GUI or G-code. A great alternative to servo arms when you want rigidity.

Hardware & cost: Below €350 per the README.

Difficulty: Hard.

Agent install prompt (paste into Claude Code, Cursor or Codex): "Read https://github.com/AngelLM/Thor and thor.angel-lm.com, make a BOM with links, and explain the firmware and control software setup."

Source: AngelLM/Thor on GitHub — https://github.com/AngelLM/Thor (facts checked against the project README, Oct 2026; prices vary by region).

Quick answers

What do you need to build Thor?
Below €350 per the README.
How hard is it to build Thor?
Hard.
Interfaces

Ideas to try with it

Our ideas, not the builder's claims.

  1. Print a full-size 6-DOF arm and drive it from a laptop
  2. Teach it to pour beads from one cup to another
  3. Use it as a display piece that waves at visitors
1 more idea
  1. Learn inverse kinematics by writing your own controller
Source
AngelLM/Thor on GitHub
Last commit
2025-05-09
Builder
AngelLM
Repo
AngelLM/Thor, 1,637 stars
Built with
Thor (DIY)

Guides: Best robot arm under $200

What to build next

Builds that share a board, robot or agent with this one.