e-NABLE Device Sizing

Proper fit is essential when making an e-NABLE device. A properly fitting device can be worn all day long without discomfort. There are four methods available for determining the proper size for an e-NABLE device, listed below. The last one, a photo-based tool, is still being tested. # Method #1 - Virtual Fitting with Fusion 360 Building upon the excellent virtual fitting methodology documented by Peter Binkley (see Method #2 below), our recommended approach for virtual fitting is using Fusion 360. Visit [this page](https://hub.e-nable.org/content/perma?id=41503) for an overview of the process, and [click here](https://a360.co/3dbva3c) to download the Fusion 360 virtual fitting project file.  --- # Method #2 - Virtual Fitting with Blender (aka the Peter Binkley Method) The most effective method for determining the proper scale for an e-NABLE device is outlined in Peter Binkley’s excellent YouTube Tutorials, shown below. Peter Binkley was honored with a [2017 InfyMakers Award](https://whenweland.com/clients/infosys/Infymakers/winners.html) for this methodology. To get started, you’ll first need to [download a copy of Blender](https://www.blender.org/download/), the open-source CAD software. Next, download Peter’s [e-NABLE Device Sizing Blender File](https://www.thingiverse.com/thing:564844) and open it with Blender. Now, watch the videos below (21 minutes total) and follow each step carefully. --- e-NABLE volunteer Donna Zimmerman prepared this [helpful summary](https://drive.google.com/open?id=1zPYuS-92SK1lsYHBk0PQ69VZTuWYxUtZ) to go along with the videos below. [https://youtu.be/ewdC3BVUNmg](oembed:https://youtu.be/ewdC3BVUNmg) [https://youtu.be/yC5UnF1tCHE](oembed:https://youtu.be/yC5UnF1tCHE) [https://youtu.be/ylc5LobLSCY](oembed:https://youtu.be/ylc5LobLSCY) [https://youtu.be/DnDBFyF1qyU](oembed:https://youtu.be/DnDBFyF1qyU) --- # Method #3 - Basic Sizing from Measurements Stephen Davies from [Team Unlimbited](http://www.teamunlimbited.org/) created an excellent spreadsheet to help determine the optimal scaling percentage for e-NABLE hand devices. [](https://drive.google.com/drive/folders/0B7IZ4iPA1DJZMC1EXy1id3NjMzQ) You can download a copy of the in either Google Sheets format or Microsoft Excel format [here](https://drive.google.com/drive/folders/0B7IZ4iPA1DJZMC1EXy1id3NjMzQ?resourcekey=0-qznFj9xlwE2LADi53Zd_Nw&usp=sharing). You’ll need to make a copy of the spreadsheet for yourself before you can make any edits (“File / Make a copy”, or “File / Download as” in Google Sheets). Just enter the values for the [Recipient’s Measurements](https://docs.google.com/document/d/1vWDoGMzwca5G__8-2kdTte2w3qs8-h_Nv7PmFLszn4w/edit?usp=sharing) (Width of Hand and Length of Hand) in cells B24 and C24. The spreadsheet will then update automatically. Refer to the matrices to determine the best scale for the device type you’re making. Use this as a general guide, but be sure to carefully examine the specific values in the matrix for the hand type you’re producing. In some cases, a close fit for hand width is more important than a close fit for hand length (i.e. for shorter hand lengths). For example, a recipient with no fingers may have a hand width of 80mm and a hand length of 80mm. Referring to the Raptor Reloaded sizing matrix, the colored “Confidence %” bar would seem to indicate that 85% is the best scale. In fact, you’d probably be better off with a 125% scale, which would fit the hand width properly. Having some extra length in the device won’t be a problem, but a device that is too narrow would be. Arm devices require additional measurements. For making the UnLimbited arm, just enter the measurements into the Thingiverse Customizer [here](http://www.thingiverse.com/thing:1672381). For the Flexy Arm and other arm devices, the spreadsheet above will help you find the best scaling factor. --- # Method #4 - Photo-Based Sizing with AI HandSizer (In Testing) [AI HandSizer](https://aihandsizer.com/) is a free website created by **Kiyan Yaghnam**, a high school student in Amman, Jordan. It estimates the print scale for the [e-NABLE Phoenix Hand v3](https://3d.nih.gov/entries/3DPX-020260) from a single photo of the recipient's hand. **Please note:** This tool is still in testing. In the designer's tests, its measurements were off by about 1.2 cm on average. Use the result as a starting point only, and always check it against Method #3 (the sizing spreadsheet) before you print. At present it gives a scale for the Phoenix Hand v3 only. To use it: 1. Place the recipient's **intact (unaffected) hand** flat on a plain, evenly lit surface, with the fingers relaxed. 2. Put any standard-size card (such as a library card, ID or bank card, 85.6 × 54 mm) next to the hand. The card is used only for scale, and nothing on it is read. You can cover the card's details if you prefer. 3. Hold the camera directly above the hand, parallel to the surface, so the whole hand, the wrist and all four corners of the card are in the photo. 4. Upload the photo at [aihandsizer.com/sizing](https://aihandsizer.com/sizing/). No account is needed, and photos are not saved. Tried it? Please share how its result compared with your measured scale on the e-NABLE Hub forum. Your feedback helps Kiyan improve the tool. _Thank you to Kiyan Yaghnam for designing AI HandSizer and offering it to the e-NABLE community._