@dc42 Ok, thanks. I think I would give it a try on my next upgrade.
I was thinking about the closed loop this afternoon. Does Duet team have investigated the feasibility of closing the acceleration loop ? With linear composite encoder, or maybe ultra-fast sample rate accelerometer ?
The idea would be a sort of closed loop feature merged with an input shaping feature. A sort of real time input shaping.
Theoretically, a motion system with sufficient sample rate and response speed could compensate and remove mechanical resonance (motors, belt, frame, leadscrew, etc.) in real time. Inputs data filtering and tuning could be a nightmare, but I wonder if there is not a track to explore on this side.