Firstly, great work Yue Mark!
I was curious if the 2.9 board is capable of inputting accelerometer readings so Klipper can process resonance feedback? Planning to use an ADXL345:
Secondly, what is the best web UI to use between OctoPi, Mainsail and Fluidd?
Seems that the SPI port for this ADXL345 on the raspberryPi is connected to the motor driver.needs to find another way.