The Raptor Hand

Developed collaboratively by some of e-NABLE’s top designers, the Raptor Hand is designed with ease of printing and assembly in mind. Features include 3D printed snap pins, a modular tensioning system, and compatibility with both velcro and leather palm enclosures. The Raptor Hand is licensed under the Creative Commons-Attribution-Share Alike license.

All files for this design can be found on Thingiverse, HERE or YouMagine, HERE. For detailed instructions on which files to download and print, see below.

You can also use e-NABLE’s web application, the Handomatic, to easily generate the STL files that are pre-scaled to the size you need.

The Raptor Hand is intended to bring together the best and most widely tested ideas from a year of crowd sourced innovation.

The objectives in designing the Raptor Hand were as follows:

  • To simplify fabrication and assembly and repair for makers and recipients alike
  • To provide a platform and reference design for future innovations, incremental and radical
  • To identify a core features set and standardized dimensions embodied in accessible 3D models with progressive licensing terms that will ensure widespread availability and future development.

e-NABLE’s prior “go to” designs included the Cyborg Beast, the Talon hand, the Ody hand and the Talon Beast. To these classics, the Raptor Hand by e-NABLE adds the following features:

  • Easier and quicker printing (no supports required)
  • Easier and quicker assembly (no Chicago Screws required, simplified cord installation)
  • An improved tensioning system (modular design, allowing for easier future development)
  • Improved documentation (coming soon)

All of the parts needed for assembly can be found easily in most areas, but if you prefer to get everything in one place, 3D Universe offers kits with all of the assembly materials needed for producing a Raptor Hand.

To obtain the materials yourself, you’ll need the following:

Part Description Supplier Order URL
Velcro (2″ wide) Amazon
Non-flexible cord Powerpro Braided Line 300 -Yard White – 80-Pound Test Amazon
Flexible cord 1.0mm Amazon
Flexible cord 2.0mm Amazon
Tippi Micro Gel Grips (size 3, clear) 3D Universe
Firm Foam Padding North Cost Medical
Tensioner screws (2×5/8in) Lowes
Tensioner screws (4×3/4in) Lowes
Tensioner screws (6×3/4in) Lowes
Tensioner screws (8×3/4in) Lowes
Palm Screw (FH PHL MS Z 4-40X3/8) Lowes
Palm Stop Nut (4-40) Lowes
Palm Screw (FH PHL MS Z 6-32X1/2) Lowes
Palm Stop Nut (6-32) Lowes


The Raptor Hand instruction manual is available here.

Assembly tutorial by Jeremy Simon of 3D Universe:

Printing instructions:

  • Scale all parts as needed (the Raptor Hand is designed to work at scales from 100% through 170%)
    • At 100%, the inside of the palm area measures 55mm
    • Measure across the widest part of the palm, then add 5mm for padding, then divide by 55 to get the scaling factor (for example, if the palm is 65mm wide, then 65 + 5 = 70, and 70 / 55 = 1.27 – so your scaling multiplier would be 1.27 or 127%)
  • Print without supports (palm and gauntlet have some supports built into the model)
  • PLA is recommended for this design
  • Suggested settings are 0.2mm layer height, 35% infill, 2 outlines
  • Refer to file names for part descriptions. The number in square brackets at the end of each file name indicates how many copies of that STL file need to be printed for a complete hand assembly.

Parts reference:

Raptor Hand Parts - Exploded View

Tying Off the Elastics

In recent revisions of the Raptor Hand, the tie-bars for tying off the elastics have been removed. The elastics should now be tied off at the wedge-shaped holes at the rear of the palm, as shown in the following picture:





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.

120 thoughts on “The Raptor Hand

  1. Hello i am really interested in the prosthetic arm and would love to assemble one for my science fair project. How would i be able to get the parts so i could assemble it?

    • Hello Jocelyn! Best thing to do is find a school, university or library near you that can print parts – or a makerspace! The files are free to download so all you need to do is get access to a 3D printer!

  2. The dovetail plug looks like a weak point in the design. I noticed it didn’t fit very closely in the video and the two little pins look quite fragile. I’d do away with that cut out and curved piece, make the back end of the gauntlet straight across then either have a small dovetail piece to glue into the back of the slot for the tensioner block, or just forget having any sort of plug there and glue the block into its slot. If you don’t want the open end of the slot to possibly snag on things, shorten the back end of the slot so it’s no longer than the block.

    One less part and a cleaner, stronger design.

    Another possibility would be integrating the block into the gauntlet, but depending on the printer it could cause issues with the holes for the tensioner pins.

    • Hello Peter – the files are generated by software on the computer and then fed into the 3D printers as a file or code which tells the 3D printer how to print it. 🙂

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    • Hello Liam – that would be a question for our forums! 🙂

  4. I printed a test model at 64% instead of 1:1 or bigger. Are there any adjustments that can be made to use the existing list of parts for a person with a smaller hand?

    • Hi Dylan – please visit our forums! They will be able to best answer this for you!

  5. My students have printed the K1 hand. We are struggling to find what materials we should buy to assemble it and instructions on how to assemble it. Please help!

    • Hello Joy! I am not sure if we have much in the way of assembly instructions for that one yet! Please email me at and Ill forward you to Evan, who designed it and maybe he can help!! – Jen

  6. What are the advantages of this raptor hand ? Is it useful under any medical circumstances ?

    • Hello!

      The advantages are a basic grasping motion, giving those without fingers, the ability to hold onto simple objects like a hairbrush, cup, water bottle, etc that they can not hold without fingers.

  7. I have a raptor model hand delivered from a volunteer. I am missing several pins. Suggestions would be great!

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