BIQU Smart Display Controller Ramps 1.4 2004LCD Controller with Adapter for 3D Printer RepRap Adapter Popular RepRap 3D Printer LCD Controller and SD Card Reader The intelligent controller includes an SD card reader, rotary encoders and a 20-character  4 line LCD display You can easily connect it to your RAMPS 1.4 board using "smart adapter" included 3D design print without a computer, just use the G code design stored on the SD card With Smart LCD Controller you can print 3D designs without USB connection to your computer