This is a simple keyboard tray that mounts to a 2020 extrusion. It was designed specifically to hold this Rii K12 Ultra Slim Wireless

Keyboard/touchpad: http://amzn.to/2ghaDOl

It can of course hold other keyboards or items.

I use this in conjunction with my 7 inch Raspberry Pi Touch screen and Pi 2 to run Octoprint. It provides a nice little kiosk on the printer itself.

The 7 in LCD mount can be found here: http://www.thingiverse.com/thing:1670214

The 7 in Touchscreen can be purchased here: http://amzn.to/2g6p5dr

Print instructions

Rafts: No
Supports: No
Resolution: 0.2
Infill: 25-50% Gyroid or Cubic
Walls: 3

Does not require supports, but may require a brim for adhesion. If the long version won't fit on your bed, print the shorter version.