Support piece for SainSmart kit: http://www.sainsmart.com/sainsmart-mega2560-board-3-5-tft-lcd-module-display-shield-kit-for-atmel-atmega-avr-16au-atmega8u2.html When both the shields are stacked, they are kind of flappy. This part fits on one end to support the LCD shield so you don't BREAK THE F'ING pin connectors when you use the touch screen. In keeping with all things 3D printed, it is held together with zip ties. 4 of them. Nothing screams 3D quality like zip ties! When routing them, use a tweezer to bend the zip ties though the holes on the shields. And drill out the horizontal holes with an 1/8" bit. The access slot on the end is for the SD card. It is going to be a pain if you regularly remove the card. The card slides in just fine but to get it out, you'll need to snip the zip ties. Chop stix might work but for crying out loud, you have a 3D printer-- you can spare 4 zip ties. Sketchup file included if you want to tweak it somehow.