OpenPedal Harp Pedals

Why This Was Created

These are the pedals used in the OpenPedal system to activate the flat, natural, and sharp positions for each note. They are shaped to activate electronic switches, instead of a traditional rod/cable based pedal harp action. Each pedal is embossed with its corresponding note name to make identification and installation easier during assembly.

I’ve printed them in both PLA and ABS, and while PLA works for basic testing, ABS provides better durability over time. For high-precision builds or showpiece instruments, they can also be resin printed — I recommend something like Phrozen Onyx Impact Plus for strength and detail. You can also 3D print them and use them to make molds if you want to cast them in another material!

In the ZIP archive, you’ll receive:

• OpenPedal_Harp_Pedals.stl — All 3 pedal types in a single file

• OpenPedal_Harp_Pedals_C/F.stl — Pedal for C and F strings

• OpenPedal_Harp_Pedals_D/G/A.stl — Pedal for D, G, and A strings

• OpenPedal_Harp_Pedals_B/E.stl — Pedal for B and E strings

Note: These are the current working prototypes. As improvements are made to fit, strength, or design, updates will be posted here.

Fabrication Notes

• 3D Printing:

  • PLA+ is okay for quick testing and low-load scenarios.

  • ABS is preferred for mechanical strength and temperature resistance.

  • Resin printing is ideal for high-resolution builds — use strong impact-resistant resin.

  • You can also use the STL files to create silicone molds and cast the parts in alternative materials like nylon-filled resin, carbon, or even metal.

Orientation tip: The pedals are flat on the bottom to aid in ease of 3D printing or mold making.

Licensing & Ethos

This part — like the rest of the OpenPedal project — is released under the Creative Commons Attribution–NonCommercial 4.0 International (CC BY-NC 4.0) license.

✅ You are free to:

• Use and modify the files

• Share them non-commercially

• Remix and adapt the part for your own harp project
  (And if you do — please share it with us! We'd love to feature your work.)

🚫 You may not:

• Sell these files or derivatives as commercial products

• Manufacture this part for resale without written permission

This project is open-source to encourage collaboration and accessibility, not to enable third-party resale. Please respect the spirit of the license — and support those who support the project.

Need Adjustments?

If you need modifications or dimensional changes for your specific harp build, feel free to reach out via the Contact Us page.I (Matthew Finlay) will provide updates free of charge — all I ask is that we’re allowed to share your improvements to help others build their dreams.