The aproximate cost of this 3D printable key turing device is about $0.18 with using Hatchbox Pla from Amazon (https://www.amazon.com/HATCHBOX-3D-Filament-Dimensional-Accuracy/dp/B00J0ECR5I/ref=sr_1_4?s=industrial&ie=UTF8&qid=1540474617&sr=1-4&keywords=hatchbox+pla+1.75&dpID=51Xo-t5eC2L&preST=_SX342_QL70_&dpSrc=srch)

The closest key turing assistive device that i found was only able to use for one key and requires the key to be screwed in and costed $8.The device can be found here (https://www.arthritissupplies.com/finger-grip-key-turning-aid.html) This device I created allows the use for multiple keys and can be attached to a keychain. If the size of this device is increased in a slicing program by roughly 5% this device can also be used for turning the lock on the inside of a door knob as well. For print settings see the printing tip section below.