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I found this great handle http://www.thingiverse.com/thing:129760 for hex wrenches. However it was for only one size. I've create a customizable version so you can create your own for different size keys.
The best approach is to use the customizer, although you can download one of the STL files if it matches the size of your key.
To use the customizer, measure the width of the key, when rotated so it's the widest (as shown in the photo with the digital calipers). Enter this number as the diameter for the hole.
By default, the slot is increased in size by 0.15mm to compensate for differences in printing. You can adjust this to make it looser or tighter.
You can also change the diameter of the handle. I prefer the 25mm size that is the default.
Handle for Allen/Hex Wrench/Key by JohnSL is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure JohnSL would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!