1.Reprap 2004LCD carries with SD card which is easy to get interference because of faster transmission rate when transfers data to main board by data line. That will inexplicably shut the machine down , or the print head run around etc .To reduce interference ,data line shielded with foil should connects to ground, while as short as possible .
3.This is customized product which mainly solve the interference problem of SD card. If required, please tell us in advance .
2) If you use it on Ramps1.4, you need the L-shaped adapter board.