A typically 5 Volt signal (HIGH) drops to 0 Volt (LOW): Normally closed (NC) switch.Regardless of the type the basic way of working is the same: Hardware endstops are electrically connected to the endstop ports of the printer control board and will provide a signal when the endstop condition is met.įigure 2: Most common endstops (left to right): Micro switch, optical endstop (light barrier), hall sensor (magnetic) Should any movement try to exceed the physical limits of the machine, the endstop will cut the movement. The other important aspect of an endstop is protecting the hardware from damage. Homing can be initiated either via the G28 G-code or via the LCD controller.įigure 1: LCD indication not homed axes (Marlin <= v1.1.8) Safety This means the system needs first to establish its starting point of the physical (machine) coordinate system, a process called Homing. Marlin indicates this by blinking question-marks in place of X, Y and Z on the LCD screen (v1.1.8 and older) or blinking ‘?’ in place of the coordinates besides X,Y and Z (Marlin v1.1.9 / v2.0.0 and newer). Electromagnetic Interference / Electric Noise impact on endstopsĮndstops fulfill two important functions in a 3D printer: Reference system for the axes system and safety.Īfter powering up a 3D printer the printer’s controller board does not know at which position its axes are.The following chapter will provide information on: M306: Model predictive temperature controlĮndstops or limit switches are used on every moving axes of a 3D printer.
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