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Flexy arm II Thermoformed

by ChristianSilva, published

Flexy arm II Thermoformed by ChristianSilva Feb 17, 2016

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Summary

Flexy arm II thermoformed is based in the Flexy_Hand 2 from Steve Wood (Gyrobot), The RIT arm (Rochester Institute of Technology) and the work of the e_NABLE group ( http://enablingthefuture.org/ ) (http://www.teamunlimbited.org/the-unlimbited-arm/ ). All this files are covered by creative commons attribution license. Non-Commercial-No derivatives

All reproduction o derivatives from this model should be supervised by his main developer (Christian Silva) or a certified professional in the handling of prostheses and orthoses.

It is no a model for comercial use and all kind of intention of sell and make business or take profit from it or any derivation remix etc will be punished by the law in exception to his main developer which is Christian Silva

Thanks for the support and participation on this project to Francisco Posada https://www.facebook.com/pacho.posada?fref=ts who since December of 2015 has developed part of this arm under the direction of Christian Silva to Who belongs this intelectual creation

Videos Using the 3D printed Prosthesis arm thermoformed

https://youtu.be/FLD15aMUNmQ
https://youtu.be/aKfixidpso8
https://youtu.be/QGR5nHnKNeA

All parents and children were informed about the research study and signed a parental permission. For Children 3 to 16, an assent was explained by the principal investigator and signed by the children and their parents. Written informed consent from the parents was obtained in order to publish the images and videos shown in the research study and investigation. Futhermore, detailed safety guidelines were given to parents regarding the use and care of the prosthetic arm.

Detailed safety guidelines link:

http://enablingthefuture.org/build-a-hand/safety-guidelines/

Fingers are printed in Flexy Material, Hand Body, Forearm and Arm in PLA Material.

For more information:

http://casilvaca.wix.com/coprinte3d
https://www.facebook.com/EnableColombia/
http://enablingthefuture.org/
http://www.teamunlimbited.org/the-unlimbited-arm/

https://www.youtube.com/user/MrChristhofher13/videos

Ms. Eng. Christian Silva, Bogota, Colombia. e-NABLE Volunteer
Universidad Nacional de Colombia

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Where can I get this skin type of filament?

Este stl es solo lado derecho?

Awesome design! Its printing like a champ so far. Just one question: The finger sizes and hinges look to be a lot smaller than the palm and wrist pins. Am I missing something?

Hi Christian.

Nice work, thanks for sharing it!

I have troubles slicing the fingers with Simplify3D.
It slices only the internal structure, see the picture here:
http://imgur.com/zlI3v80

I have a 0.4mm nozzle. If I resize the model to 200%, then it slices fine.
How thick is the missing finger "skin" part? My best guess is it would be ok, if this could be thickened? However I'm not sure how it affects the flexibility...

Cheers,
Janos

Hi Christian - Do you have STL files for a left arm/hand? Thx!!

Hi Christian,

I'm currently in Ghana helping to kickstart a new e-NABLE chapter. It's been an amazing experience so far and we have learned a ton. Two important lessons we've learned are 1) Recipients need arms, not hands and 2) They want arms that look natural. In that spirit, I think this new design a perfect fit for this region. The problem is that I have no experience with printing flexible filaments. I brought a PLA-based Flexy hand, which is what every recipient is gravitating to here.

Can you recommend a mid-range printer ($1000-2000USD) that can reliably print flexible filament for this arm? There is not a lot of 3D printing tech knowledge here and getting replacement parts is near impossible, so something stable and reliable is ideal.

Thanks for any advice you can offer.

Best,
Joe

Hi Joe
I am also setting up a workshop in a school for disabled in Tanzania. I am using a Hephestos 2 and it is working well with ICE FILAMENTS ICEFIL1FLX139 FLEX Filament, 1.75 mm
I have been told that PLA can soften in the Tanzanian sun. Do you have experience of this?

We used PLA for devices in Ghana, which gets up to almost 50C on some days. SO far we haven't had any negative reports on the PLA. I would suggest NOT leaving it the car on a hot day, though. In my experience, PLA starts to get soft around 90-100C.

Note that the elastic bands used in the Phoenix hand DO break down quickly in heat and humidity. I don't know of a solution for that other than to use the Raptor instead. It shouldn't be an issue for the Flexy.

Hi again Joe
Thanks for the quick response.
How is your project going? Do you have a website?
Cheers
Gilbert

Hi Gilbert - Our non-profit is at www.enableoutreach.org. We've stopped pushing the Flexy arm. Our volunteers had a hard time sizing, printing and assembling it. We're now focusing on the UnLimbited arm.

Hi Joe
Tried printing part of the Flex arm before I read your comment. For some reason at approx. 15mm high it jumped about 3mm along the Y axis and then again after a further 5mm. Stopped the print now anyway and going to email the manufacturers to see if they know. Drive belts all appear tight.
Looks like great work you are doing out there. I hope to be in Tanzania January.
Cheers, Gilbert

Hi Joe, I can recommed only the printer that I have been using for a long time only to print flexy filament, it´s http://protolab3d.co/ this printer is very robust and you can trust that It will work very well with flexy material. It cost around 1000 dollars.

Thank you Christian! Would you be willing to share the original IGES, STEP or Fusion files so we can make tweaks for our eNABLE recipients?

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