Feature: 1. SUPPORT VARIOUS SCREEN: This is a 3D printer main control board with onboard ESP32 wifi, supports for Marlin2.0 firmware, in addition to ordinary LCD2004, 12864 screen, also supports for MKS MINI12864V3, and for MKSTFT serial screen 2. 32 BIT MICROPROCESSOR: Built in ESP32 DOWD V3 chip, for Xtensa dual core 32 bit LX6 microprocessor, supporting clock frequency up to 240MHz 3. POWERFUL AND VERSATILE: The main board adopt ESP32 WROOM 32U module, embedded dual core 32 bit high speed MCU, the clock is up to 240MHz. And integrate WIFI, Bluetooth module, update firmware through USB, can connect WIFI and web page to control printing. The performance is very powerful 4. 8M BYTE CHIP: In addition, the module has a built in 8M byte Flash memory chip, which provides effective protection for more application scenarios 5. BACK EMF PROTECTION: VEXP has designed a protection circuit for the back EMF generated by the stepper motor, which greatly reduces the damage to the motor driver Specification: Item Type: ESP32 3D Printer Motherboard MCU: ESP32 WROOM 32U MCU Frequency: 240MHz Flash: 8192K RAM: 520Kb Power Input: DC12-24V<20A Heating Head, Hot Bed: 2 Heating heads, 1 hot bed Temperature Measurement: 3NTC100K: TH1, TB, TH2 (requires jumper selection) Controllable Fans: 2 Way controllable fans Motor Interface: 5 Axes drive, 6 motor interfaces (double Z axes parallel output) Drive Mode: STEP or DIR standard mode Drive Signal: Pin out the signal, support external Subdivision Settings: DIP switch to set subdivision LCD Interface: Support ordinary LCD2004, 12864; support for MKS MINI12864V3 Serial Port: Reserved serial port 2, support for MKSTFT series serial port screen Limit: X, YZ, MT DET 3D TOUCH: Support Power Protection: Non reverse polarity protection and power spike protection Firmware: For Marlin2.0.x Firmware Update Method: Online download via USB. Package List: 1 x ESP32 3D Printer Motherboard1 x USB Cable A C Type C(1 meter) Note: MOS drive circuit, limit input, and temperature measurement circuit add Schottky diode protection to reduce damage to IO from external spikes.