Comfy OTF Fidget Knife

After fidgeting with the original OTF knife for a long time, my hand got quite sore by the sharp edges. I found an ergonomic handle that I tried out, but it didn't solve the problem fully. Because of this, I decided to improve upon both designs, and make a version that is as comfortable as possible. This is the result of that. I have changed so that the back part of the knife is rounded, that rests against the palm of the hand. I have also changed the thumb-slider to not have sharp edges. The ergonomic finger-grooves also helps making it more comfortable.