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Prothestic Hand

by Shira, published

Prothestic Hand by Shira Apr 25, 2016
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Blender

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10392Views 3222Downloads Found in Hand Tools

Summary

Prothestic Hand

Remix: http://www.thingiverse.com/thing:1095104

In this video explains the process. Enables subtitles
https://youtu.be/uWL13vvi94s

This prosthesis has been designed to help those people with missing fingers.

It has been modelled keeping in mind the following principles:
-Keep the number of printed parts as low as possible.
-Keep the assembly process as simple as possible.
-Use the least possible amount of non-printable parts. In this new model, you can choose how to join fingers, using screws (2M), axes wire, or filament printer.

  • Leave openings in the model to allow the hand to transpire.
    -The previous model had another hand rotation system on the wrist, had more freedom. On this occasion I have modified the movement of the wrist using the fantastic idea of a union that uses hand "Flexy-hand" http://www.thingiverse.com/thing:380665
    -I have also modified the system of tensioning the strings. It is safer than before and takes up less space.

The fingers flex when they are pulled by strings, such as fishing line, and extend automatically with the help of elastic cord.

A fabric strap with velcro is needed to secure the prosthesis to the arm.
You can download the original file blender, and thus can be studied and modified to improve its performance.

I hope to be successful with modifications. Thank you very much to " http://www.africadirecto.org/ " for suggesting changes and help to improve the model
https://youtu.be/9YwDoLA-IRM

Print Settings

Rafts:

No

Supports:

No

Resolution:

0.2 mm


Notes:

-Dixtal pieces: printed flexible filament "filaflex" - 80% filling
-Hand, Wrist and Proximal pieces: 20% filling
-links and cover pieces: 20% filling

Post-Printing

Tutorial: http://www.instructables.com/id/Prothestic-Hand/

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I am new to 3D printing, what kind of string are you using?

So much better than my attempt https://www.thingiverse.com/thing:1741448. Truly amazing design

100% Printable Hand(1 component)

Absolutely GORGEOUS design. Kudos Shira
I notice that you used Filaflex for the joint at the wrist like the amazing Flexy Hand design
I wonder if I could suggest a couple of changes
What if you employed filaflex for the fingers as well? Same as Flexy Hand
http://www.thingiverse.com/thing:380665
You could make it a slide in type like Flexy or a simple rectangular piece in filaflex (I´m thinking you make a slot inside both the finger joints that the filaflex hinge slides into, you put the finger joint in place and insert the pin that holds the joint and hinge in place)

This will simplify the design by eliminating the elastic cord and also reduce the effect of Hookes law - it becomes increasingly difficult to bend the fingers while defeating the elastic cord

Secondly, it would be awesome to have a whippletree mechanism inside the gauntlet. LIke this design
http://www.thingiverse.com/thing:849407
The bottom portion tied to a single tensioner (for fingers) and independent tensioner for thumb
With a whippletree, the fingers will conform to the shape of the object in the hand rather than prevent bending of the wrist when any finger reaches an object

Again, awesome design

Flexy-Hand 2
by Gyrobot
Bracer & Whippletree for Raptor Reloaded
Jul 27, 2016 - Modified Jul 27, 2016

Design is Awesome. What other things the recipient able to pick with this hand?

Your design is wonderful! The video touches me! Good job!

This looks great, nice work!

Amazing! I Need an assemble of that. I can print the prostethic as one single part. I add the screws by myself.
Can you upload an assemble?

I uploaded a file: "groups printable.zip" there you find the grouped parts:
(flexible filament .stl , hand wrist .stl, 100 filling.stl and proximal.stl)
you may find it useful

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