The RIT Arm


The RIT Arm is an adaptive device people an arm with an elbow but no wrist. It can be actuated by bending the residual elbow (video) or via a bowden cable connected to a shoulder harness (video). The arm was originally developed by e-NABLE members at Rochester Institute of Technology (video).

STL files and instructions can be found HERE.

Version 2 can be found HERE.


By accepting any design, plan, component or assembly related to the so called “e-NABLE Hand”, I understand and agree that any such information or material furnished by any individual associated with the design team is furnished as is without representation or warranties of any kind, express or implied, and is intended to be a gift  for the sole purpose of evaluating various design iterations, ideas and modifications. I understand that such improvements are intended to benefit individuals having specific disabilities and are not intended, and shall not be used, for commercial use. I further understand and agree that any individual associated with e-NABLE organization shall not be liable for any injuries or damages resulting from the use of any of the materials related to the e-NABLE hand.

37 thoughts on “The RIT Arm

  1. Made one of these for a 3rd grader in Austin Texas. Completed the hand/arm on 12/11/14. After a few practices, she picked and apple and handed it to me (her teacher).

  2. Is there anyway to combine the RIT (elbow powered arm) with the raptor hand? My son has a malformed hand but he can’t flex his wrist.

    • Hi Stewart!

      We are actually just about to release the “Raptor Wing” design – just for cases like this! It takes the raptor and the RIT arm and merges them together for kids who have no wrist or cant flex it.

      Are you in the Google+ group? We will be releasing the files there first and getting some testers first before putting them up to the public.

  3. This is great news! He could not flex the regular raptor hand enough to make it functional. And yes, I’ll be following the raptor wings developmental progress on the Google + group. This could be the solution we’ve been looking for. Thanks!

  4. How can I source this for my daughter ?? I have no access to 3D printers etc and am not very techinically minded. Id love some more info and so would she 🙂

    • Hello Andy! Please visit our “Get Started” page and fill out the intake form!

  5. Hi Jen! We are helping a boy who has the elbow joint and forearm but has no hand (amputation at the hand joint). I guess the same case of Stewart. Could you please let me know if the Raptor Wing design is the best choice? Is there already any files to try it or should we adapt the RIT Arm? Thanks!

    • Hi Charles! I think the Raptor wing would be a great place to start!

  6. Hi! We are building this arm using a DimentionSST1200es, and the support material is stuck in the holes for the non-elastic string. We’ve tried cooking the material out many times to no avail. Does anyone have any advice for this or had this same problem?

    Thank you!

  7. Hi!
    Congratulations for the sponsors and members of this huge initiative.
    I got interested in printing this for my girfriend, but I believe the fingers file is missing, isn’t it?
    May I use from another project?
    Thanks a lot

    • thank you Lucas! The files for the fingers are missing from the RIT design?

      • Yes, Jen Owen! Thanks for your attention.
        Not only for me and also for “IronShutterFly Photography by Ralph Ferro”, as he said in the very first comment above.
        I am very excited to give her as a X-mas gift.

      • Hello, Jen!
        I am also searching for fingers for this arm. waiting for your answer

  8. Hello,
    I am trying to find out where the files for the rit fingers are by any chance? I just need the fingers right before I present my friend his new rit arm. Any advice would be much appreciated.
    Thank you

  9. I extracted the files and IPT files are showing up as Word documents. Of course Inventor can’t open them. Maybe it’s me…otherwise, can someone please direct us to the files?

  10. Hi I am a student looking to print this particular RIT arm design for a student within my school. However, I am having trouble understanding how to get the measurements of the design itself to see if it will fit around his bicep. Is it a “one size fits all” type of design or is there a way to make the dimensions more suitable for this particular student?

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    • Hello! The links are listed above.

      There is the original version and the version 2 available. 🙂

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