This is designed for i3 single sheet version, but could also be used with the box frame version. It bolts on the back side of the frame, where Z axis rod holders are. The design is compatible with my i2 LCD holder, so if you are upgrading from i2 to i3, there is no need to print the LCD part again. There is also a clippable version in the files that you can download, so you can choose whether to install the LCD on Z top screws or just clip it on the frame. Of course the screw installation will be a bit sturdier. BOM: