Ody Hand 2.0

by profbink, published

Ody Hand 2.0 by profbink Mar 4, 2014
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Ody Hand 2.0 by profbink is licensed under the GNU - GPL license.

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This hand is for our friend Odysseus, who lives in Greece. It is intended to be a starter hand for children with no fingers, a small palm and some ability to flex and extend the wrist. I decided on two fingers and a thumb, so that Ody would only be fighting the resistance of three digits. Short, blunt fingers reduce the chance of putting one's eye out. ;)
A quick video showing mechanical function. Cabled with 1.2mm nylon monofilament line.
Here's a little video intro to the original Ody Hand: https://www.youtube.com/watch?v=gM8aV6coqEE
For more information or to get involved, visit http://enablingthefuture.org/
Files last updated Feb 22 2016


For Ody Hand 2.0 and beyond, Use the Osprey instructions:

I can easily make tighter and looser sets of pins and proximals, and I will edit the whole design to meet the needs of a particular user or maker, so if you have any suggestions or questions, please ask me in the comments. I want to make this design work for you.

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Totally looks like a Ninja Turtle hand.

This is an awesome design! I fully appreciate that creating the stl directly in Blender is the right answer for this design. Getting the curves right in a CAD program would be a nightmare.

However, what happens to the passages and holes when the design is scaled? Don't they get smaller also? Is that a problem?

Aren't there "source" files created in Blender? Could those be posted? If not, a useful compromise would be to create the stls without the holes and passages. Then use OpenSCAD to create the necessary holes. This way the scale would be independent of the hole/passage size. Spacing could be a parameter so that they landed in the right places. Now that I think about it, this could be done with the existing stl files to solve issues with scaling (if there are any).

Blender is what I know, so there are no parametric tweaks here. Snap pins go a long way to solve hardware sizing issues, but still many holes need hardware and you have to guess, and possibly drill and ream out holes to persuade a good fit at different print scales.

What is the purpose of the long extensions under the finger tip of the ody_distal? Is this to provide a base for support material or what? Is it to be cut off and sanded away after printing?

Also, what is the purpose of the the three versions of Ody_Bars? Are all three used? If not, which version is actually used?

Finally, which version of the KnucklePins should be used? Why are there two versions.

Thanks. I am preparing to print this as my "test hand". I've watched the videos about building it (or it's big brother), but I'm unclear about a few details.Hence the questions.

The long extensions are support material. I added them so you could print with zero support settings and not have to clean support material out of tiny channels. They work really well on that overhang, even if your printer over-extrudes a bit. Break them off and file them down.
Sorry about the three versions of Ody Bars. Now you'll find only two files for arm bars: OdyBarsFat3, which has spacers for a single strap, and ArmBarsStrapFat2.2, which has spacers for two straps.
The two versions of knuckle pins have different removal strategies. The head versions can be removed with the blade of a knife, but the other version needs a small screw to turn into the hole, then pull out. Print both and see which you prefer; it's not much filament wasted.
I'm working on some decent instructions for the Ody Hand and Talon Hand, including bills of materials. Stay tuned..

Thanks for the clarifications. Indeed, the distal prints great without support. Much better than trying to clean out the support material from those little passages.

Where did you find the 0.050" weedeater filament? The smallest I could find at Lowe's was 0.065".

Your instructions will be much appreciated.

Here are the new instructions. I know, the instructions are for the Osprey, but a lot of it applies to the Ody hand too, especially with the new bracer.

Yeah, those distals were the only thing I needed to print with support on my over-extruding printer. Adding support structures to the model itself has saved me hours of post-print drudgery.

0.050" round trimmer line is not easy to find. I had to order it online. I recently found some fishing leader on ebay in diameters between 1mm and 2.2mm in 0.2mm increments. I ordered some today and I'm going to try it out.

Here are the instructions I'm working on. I'm sorry about how messy and disorganized it is. I really need some diagrams and photos.


My company FATHOM is trying to donate an Ody hand to a girl in need but we want to make some modifications for her. Can you please share the 3D CAD files (solid works, step, or Iges)? If you prefer to contact me thru email you can reach me at [email protected]

The Ody Hand was modeled in Blender, which works directly with meshes. There are no solid body or CAD files. Sorry.
If there are specific modifications you would like to see, let me know, and I'll see what I can do.