With the G1 command you can move the printer. However, where the G1 command moves your printer depends on whether you are in absolute or relative mode. Absolute mode is enabled whenever you send the command G90, relative mode is enabled when you send the command G91. Whenever you are printing absolute mode is typically enabled. If you restart your printer, absolute mode will also be enabled. If you send the command G1 X150 Y120 Z100 in absolute mode (G90), the printer will move to the position X = 150mm, Y = 120mm and Z = 100mm, relative to the origin. If you send the same command in relative mode (G91), it will send the printer 150 mm in the positive X-direction, 120 mm in the positive Y-direction and 100 mm in the Z-direction relative to where the printer currently is positioned. The same command can send the printer to two completely different places depending on what mode you are in. As you saw in one of the commands above, the move command, G1, can also have an E parameter, this allows for a movement of the extruder motor.