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Flexy-Hand - Filaflex Remix

by Gyrobot, published

Flexy-Hand - Filaflex Remix by Gyrobot Apr 10, 2015

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18964Views 5535Downloads Found in People

Summary

This takes FDM printing with elastic filaments to the next level.

An iteration of the original Flexy-Hand, whose fingers are optimised to be printed with elastic filaments. This version was printed with Skin I Filaflex, Skin II also available.

Key Features :

  • Hidden finger hinges, it's all in the geometry.
  • Fingers compatible with the Flexy-Hand family.
  • Each finger and thumb is printed in one piece. Using CraftWare customisable supports.
  • Silent realistic articulation.
  • Two thumb angle variants.
  • Base mountable, can be used as a terminal device for an existing prosthesis.

Thanks to Jeff Erenstone of Performance Orthopedic Design for his recommendations and consultation along this design process.

http://www.gyrobot.co.uk
http://www.facebook.com/gyrobotuk

Instructions

Printing

  • Print the fingers in elastic filament (e.g. Filaflex) on their end like they are orientated in the STL file.

  • Print fingers with support to add stability. I used Craftware's customisable supports. Also reduce extrusion width and layer height until the thin skin covering the hinge areas have two complete perimeters.

  • Print the base hinges, then dab a glue to the hinge to keep attached to finger. I printed hinges with no infill and 3 perimeters (depends on scale) using Slic3r, this makes them nice and "spongy" adjust this if you want stiffer or more flexible hinges. The hinges at the base of the fingers are assembled a certain way round to aid finger return, please see section image to show this.

  • Print the bolt plug and bolt carrier in rigid material. The bolt carrier will benefit by printing the first few layers with the same coloured material as the hand to help concealment.

  • At 100% scale, use an M12 or industry standard 1/2" HEX headed screw/bolt to mount to prosthesis.

Stringing the Tendons

  • Thread a tendon down the tip of the finger and immediately back out of the tip so that the tendon loops around the integral tie bar at the end of the fingertip. A small piece of wire (paperclip) bent into a hook is a useful tool for grabbing the tendon to pull back out again. Tie this tendon off and secure knot with Superglue.

  • A long stiff wire is good to send down the tendon channels first then attach the tendon to this wire to pull through to the base of the finger.

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sorry to bother but where is the palm alone? I see hand with all fingers stl but not alone....thanks

What part to I use for the thumb joint?

Pensé que iba a obtener mejores resultados. No cierra completamente la mano.
Con que relleno se imprime?
Saludos

Sep 15, 2015 - Modified Sep 15, 2015
dtj

What's the recommended infill for the fingers?

I have printed this palm a few times now and it's beautiful. However I have been just using the old hinged fingers because I can't get the control cable threaded through. When I try to push the cable through, it just bunches up in the joint cavity of these new fingers. Any thoughts on how to do it?

Out of curiosity, why not make the whole hand print in place? Does the proximal joint move too far for the fila-flex to stretch?

Thanks in advance!

Aug 5, 2015 - Modified Aug 5, 2015
Gyrobot - in reply to Btown

I use a long stiff wire to thread down the channels first and then tie the tendon to this to pull through. A large thick metal paperclip unfolded is perfect.

A print in place hand is viable but it's a big print to fail if the top of the fingers wobble around too much.

Thank you for making, please upload make when finished.

Cheers,
Gyrobot.

I have printed this palm a few times now and it's beautiful. However I have been just using the old hinged fingers because I can't get the control cable threaded through. When I try to push the cable through, it just bunches up in the joint cavity of these new fingers. Any thoughts on how to do it?

Out of curiosity, why not make the whole hand print in place? Does the proximal joint move too far for the fila-flex to stretch?

Thanks in advance!

@makerbot , Why is this so hard to find with the default search for thingiverse? Sure we can add it to collections and bookmark the page, but this is an awesome design and deserves to be the FIRST results when you search for "Flexy-Hand" or Flexy Hand" or even "E-nable".

Lol, I always use Google (insert favourite search engine) to search Thingiverse.

When robots rule the earth I'll be blaming you for the T-101

I'm guessing the next step would be to weld the fingers onto the hand.

You are really pushing the boundaries of what printers are doing.
This is amazing work.

Beautiful work, as per usual :)

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