This model has been the result of many prototypes. Fits the original key extremely well. Print with manual supports painted in the areas shown, and with as fine as a layer height as possible. Simply slide the buttons into the main piece, put the motherboard in, and slide the backplate on with a satisfying click. As you can see in one of the pictures, there is a thin spot for the key fob light to shine through. even if you don't need it, its a fun little project! The latest model does not have ridges on the back, but rather a notch for the backplate to be popped open with the key. I did some tweaking on the mechanism, so please comment any suggestions!