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Finger Wrench (digit spanner)UPDATE: 020116
I've evolved the design to a 'Pro' version.
A sleeker design and more ergonomic on the finger
I recently discovered this great little gadget on a DIY blog but unfortunately the company that originally supplied it is no longer making the product (why??) and i can't find anywhere to purchase existing stock.
I had to have one, so I modelled and 3D printed this little beauty and it works a treat!
Easy to use:
There is a gap all down the back side, thereby allowing one size to fit a wide range of fingers. Slip a nut or bolt into the wrench as shown in the two images. Finger pressure keeps the nut or bolt in place. The tapered slot inside the wrench prevents the nut or bolt from turning.
Suitable for 1/2inch nut/bolt and smaller.
Print PLA (http://www.faberdashery.co.uk/products-page/print-materials/mellow-yellow/) or ABS 0.2mm 100% infill for strength.