Ada Robotic Hand

by openbionics, published

Ada Robotic Hand by openbionics Jan 26, 2016
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This is the Ada robotic hand from Open Bionics, a fully 3D printable robotic hand, derived from the Dextrus robotic hand by the Open Hand Project .This hand design is completely open source and free for you to download and use.

All of the components required for a right hand start with 'R' and the components for a left hand start with 'L'.

A single hand requires the following 3D printed components:

  • Palm
  • Back Cover
  • PCB Tray Upper
  • PCB Tray Lower

Non-3D printed components:

For assembly instructions and a guide on installing the firmware, we have written a few tutorials.


Version History
16/02/16 - Ada V1.1
A step was added on the dorsal (back) side of the proximal finger joints. This "absorbs" the impact of any top layer curling during printing, protecting the joints. This should prevent any hands printing with floppy fingers on un-optimised machines.
02/02/16 - Ada V1.0
Initial release of the Ada hand

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.

Print Settings

Printer Brand:









Print Settings Cont.

Palm - Ninjaflex
Back cover - PLA/ABS
PCB tray upper - PLA/ABS
PCB tray lower - PLA/ABS

Print Orientation
Print all of the parts in the orientation seen on thingiverse

Support Settings
Palm - Touching build plate
Back cover - Everywhere
PCB tray upper - None
PCB tray lower - None

For a more detailed print settings, visit our printing tutorial

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I can't find any instructions and something about installing the firmware on the link. Where can I find the instructions?

I am not the designer but can answer all those questions like is there a right and left hand, where to get the printed circuit controller and about the CAD files Easy answer. This project is stored on GitHub. Only a subset of the files were posted here. If you want a PCB you will have to have it made from the design files.

Be warned that the linear actuators this hand uses cost about almost $100 each and you need five of them.


Can you share the palm files with the proper support generated on here or on [email protected]
I think the simplify3D software is generating too much support for the internal parts of the palm in the orientation you've mentioned.
Printing using a TEVO Tornado Printer.
Great design by the way :)


Is there any way I could get the original IGS files for this hand? I am getting a couple of errors when I try to load the palm STL file into the 3D printer software.

The left hand where is it? I try to make a prosthesis for a guy who has lost his arm .. Thank you for your work!

where can i buy the almond PCB?

i'm doing a similar project right now and this design would be like an improvement compared to my design,
how much did you spend for the entire project?
and is there any video on assembly of the hand?


I wonder if I can graft this hand onto my InMoov build, modifying to incorporate the servos in the wrist that the InMoov uses. it is a thing of beauty.

The actuators and that control PCB seem very expensive. Why would that be?

PS - This is very very beautiful.

Hi Doc,

Thanks for your comment.

We find the price for the Ada hand kits to be extremely competitive with other robotic hands. Most robotic hands for research purposes would run well into the thousands of pounds. The MechaTE robot hand is the only other one in this price range and it's more expensive but doesn't have a control board.

The reason the individual components are priced as they are is due to the low manufacturing volumes. A robotic hand is not a consumer product so the components can't be purchased or manufactured in high volumes and hence cost more unfortunately.

PS - Thank you, we really appreciate your kind words on the design.

Thanks for the feedback - I certainly don't know much about this exact application space, though I am well acquainted with electronics in general. I was just getting excited to build one but then saw the electronics cost was around 10x what I'd be able to commit to such a project. Maybe later. Keep up the wonderful work!