This simple thing extends the length (and comfort) of your thumbsticks allowing for faster accuracy and much more precise aim in mainly fps games.
I had seen these kind of "thumbstick extenders." being praised on the internet but i was a bit cynical. Almost all the reviews where sponsored by the company making the product and i could not find any really negative ones. So i decided to try them out by designing my own.
The way these work is they make the leverage of the stick itself almost 50% longer making it very light to move the sticks. They also allow for a larger range of motion enabling to use much higher sensitivity (I used to have a sensitivity of 40% in bf4, now i'm using 95% and i'm still much more accurate)
There are two models, the PS4Cap which has the cross (in the pictures) for additional grip and a flat one. I highly recommend some kind of decal or pattern on the surface since PLA and ABS are both very slippery and don't give much grip naturally.
If you have an Xbox One, PS3 or Xbox 360 and these don't fit please send me the measurements and i will make new models for them!