S6 V1.2 samples received. If there no more problems. This will be the first version to sell.
1. Based on STM32F446 180Mhz
2. 6 TMC sepper drivers support, noneed wire Uart/SPI
3. Power input prevents reverse circuit
4. 12V/5A DC-DC circuit
5. Two car fuses for hot bed input and main power input
6. Limit switch socket 24V/5V/3.3V optional, ready for more other equipment, such as inductive sensor, BL-Touch