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Reborn Hand

by enablesierraleone, published

Reborn Hand by enablesierraleone Mar 31, 2017
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Summary

This is a Remix of the Phoenix Hand & UnLimbited Arm, designed by Albert Fung. This project is a collaboration between e-NABLE Sierra Leone and the Hong Kong Maker Club.

It became apparent in our previous feasibility study that for the 3D printed prosthetics to survive the tropics, we need to remove components that are not well-adapted to hot weather. We therefore set out to replace all the rubber bands in the Phoenix hand.

Palm: We used the One-Arm palm designed by below_cho as out starting point. All the cable tunnels have been widened, the knuckle stumps removed, and a bar is added at the thumb base for tying elastic cord.

Palm mesh: we have modified the thick palm mesh by John Diamond to strengthen the screw holes.

Fingers: Tunnels have been created so an elastic cord can now run all the way from the finger tip up into the palm.

Pins: For snug fitting, some of the pins have been resized and reshaped.

Hope you'll find this new remix useful!

Ed Choi

Links:

e-NABLE Sierra Leone - Facebook
http://www.facebook.com/enablesierraleone

e-NABLE Sierra Leone - CrowdFunding
http://www.GoFundMe.com/enablesierraleone

Albert Fung - designer
http://albertfung.ca

Hong Kong Maker Club - collaborator
https://www.facebook.com/hongkongmakerclub/

Raise3D HK Printer - manufacturing
https://www.facebook.com/raise3dhk/

Printact 3D Printer - prototyping
http://www.printact.co

Print Settings

Rafts:

Yes

Supports:

Yes

Infill:

30%


Notes:

::: Construction notes :::

For a wrist-powered prosthetic hand, please use the Reborn Hand with a thermal gauntlet.
http://www.thingiverse.com/thing:864030 and tensioner/tensioner pins from the Raptor Reloaded. http://www.thingiverse.com/thing:596966

For an elbow-powered prosthetic arm, please use the Reborn Hand with the forearm and bicep cuff from the UnLimbited Arm.
http://www.thingiverse.com/thing:1672381
http://www.teamunlimbited.org/the-unlimbited-arm-20-alfie-edition-current/

We printed the Reborn hand at 124% and used it with parametric forearm, cuff and tensioner pins from the UnLimbited Arm(v2.0). From our field experience, the UnLimbited Arm cuff pins are not stronger enough to hold the elbow in place for very long. So we advice everyone to use Chicago/binding screws (glued) instead.

Scaling the ReBorn Hand parts at 124% would give you:

Palm width (widest): 80mm
Wrist joint (outside): 75mm
Wrist joint (inside): 64mm

Additional materials:

1) Braided fishing line - 80lb.
http://www.ebay.com/itm/KastKing-SuperPower-Braided-Fishing-Line-330-yds-1100yds-SELECT-LB-TEST-/190909992257?var=&hash=item2c731f4d41:m:m6k91tkQ1bIzQbS8tDpHzaQ

2) Elastic cords - 1.5mm - for hands printed at 100% or above

3) Screws - for tensioner block - Hands printed at 124%:
single thread woodscrew 3.0 x 30mm

4) Screws - for palm mesh printed at 124%:
Reassure R2 - full thread woodscrew 3.0 x 16mm

5) Silicone fingertip grips - Tipper Lee, and superglued to secure them to the fingers

6) Velcro - 1 inch thick double-sided

7) Adhesive Foam - 5mm thick
https://www.amazon.co.uk/Self-Adhesive-various-including-padding-Outfitting/dp/B002GUB9R0/ref=sr_1_5?s=sports&ie=UTF8&qid=1491140349&sr=1-5

8) 13mm binding screws for the elbow joints (use superglue or Loctite to prevent loosening).

9) Loctite 243 seal thread
http://www.ebay.com/itm/121826873262?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT

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Does anyone have a STEP file for this? I need to remove the thumb and little finger.

for some reason The Palms can't be handled by Slic3r 1.3.0. leaving out many layers mid print. Anyone else see this problem?

Interesting. I used Cura and had no problems. Let me asked my professional printers and get back to you.

In that case, please try using other softwares.

My 3D manufacturer uses the program "Ideamaker" and had no problem with the palms. I have printed the Pheonix palm and sliced it using Cura and had no problem. Cura is free :)

https://ultimaker.com/en/products/cura-software

I managed to fix the issue (For those that would like to use Slic3r). I opened the stl in FreeCad and repaired the non-manifolds. more information here. http://manual.slic3r.org/advanced/repairing-models

Just fixing the manifolds issues seems to do the trick.

Oh good! That's very useful to know. Thanks!

I can try using Cura, I have it, but it can't do everything Slic3r does. Most importantly z-offset changes (I'll need to jump through some hoops). Any chance the cad files are available so I (others) can generate their own STL files? Thx

We directly altered and modified the STL files of Phoenix Hand v2... so, sorry, no CAD file.

where is the actual design for the "gauntlet"? The image seems to show something else than the gauntlet from other hands. Thx

Hi mvI03, that gauntlet is from the UnLimbited Arm v2.0

http://www.teamunlimbited.org/the-unlimbited-arm-20-alfie-edition-current/

Print the Reborn Hand at 124% and it will be compatible with the UnLimbited arm gauntlet.

great job! im working with 3 patients who needs this hand.. i wonder where does the elastic cords ends. Cant see a clear picture of it, thanks for sharing

Thank you. Regarding the elastic cords:

1- thumb - tie onto a bar on the palm at the thumb base
2 - index & middle finger - they share one elastic cord running up one finger and up the palm, making a U-turn at the wrist, and then running down to the next finger.
3 - fourth & little finger - they share one elastic cord just like in 2.

Do let me know if you want me to elaborate a little more.

I'm happy that rubber bands will not be needed for this hand! One question: In the summary, you mention "Palm mesh: we have modified the thick palm mesh by John Diamond to strengthen the screw holes." I do not see a modified palm mesh in the list of files for this thing.

Palm mesh for the e-NABLE Phoenix hand

Hi CaptObvious. Thanks for the comment. The new meshes are up now. They were lost in multiple rounds of updating. Thank you! - Ed

Would the gauntlet from the Phoenix V2 work with this model palm? Thanks.

Hello Mr Joeyman,

Yes it would work with Phoenix V2's gauntlet, as long as you scale them to the same %.

Have fun with it!

Ed

I have made a child sized Phoenix. I would like to make this reborn for an adult. What are the sizes for the adults in the videos, and for the example picture on this page? Are they scaled to a particular percentage, from a standard of a 100% sized model? Or is this model already set for an adult size.

(I am assuming that the model for download here, will download in a 100% size measurement for comparison, ie.. can be scaled to different percentages for different fits)

Hi Mr Joeyman,

Yes the download size is 100%, comparable to the 100% Pheonix hand. I then scale the palm/fingers up to 124% to use them with the arm parts of the UnLimbited Arm.

At 124%, the palm's wrist joint is 7.5cm wide.

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