3D Touch Auto Leveling Sensor for 3D printers 3DTouch is an auto leveling sensor for 3D Printers that can precisely measure the tilt of your print surface. It can greatly improve the printing precision of your 3D Printer. 3DTouch features simple, smart, and precise. It could work with nearly any kind of bed materials, such as glasses, woods, metals, and so on. The main functions and controls of 3DTouch are the same as most auto bed leveling sensors, which consist of an RC servo and a micro switch, thus, 3DTouch can be used on almost every 3D printer control board. By using progressively designed solenoid and hall sensors, 3DTouch can integrate high precision in such a simple structure. To make it more user-friendly and to bring you more enjoyable printing experience we add many smart functions such as self-test, false alarm, alarm release, and test mode for M119. Operating conditions: 3DTouch can be operated in the following condition. One I/O for control (PWM or Software PWM) One I/O for Z min (Z Probe) GND and +5V power Wiring: 3-pin: Brown (-, GND), Red (+5V), Orange (control signal) 2-pin: Black (-, GND), White (Z min) Note: ?3DTouch must be kept perpendicular to the ground. Additional power supply can be needed in case your board does not supply enough amperage. Electronic devices can be damaged or even destroyed if connected to the wrong side polarity. The action as pulling/pushing hard the push-pin can make the BLTouch damaged and less accurate. If push-pin down error occurs, turn core 180 degrees with Allen-key so that the core is further inside the casing.