Using the BigTreeTech BTT Pi V1.2 is easy. First, connect it to your 3D printer. Make sure to use a 12V - 24V DC power supply for the best performance. When connecting the ADXL345 3 - axis accelerometer or CAN Bus, follow the wiring diagrams carefully. As for maintenance, keep it in a clean and dry place. Avoid exposing it to extreme temperatures. If you notice any issues, check the connections first. And remember, don't try to open it up unless you're sure what you're doing.