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My Prusa Mk4 firmware version (6.0.0) seemed to break the input shaping, as it was greyed out in the menu. Upgrading to 6.0.1 today fixed it! Here's the comparison before and after. It doesn't look completely tuned in after (see the line in the arrow changes to be before the edge rather than the splodge after) but it's a lot better. It would be really cool if we could add the accelerometer to the board & calibrate it perfectly! I'm still trying to track down the cause of the lines you can see in both prints, which seems to be belt related. It goes away at 200% print speed, but so do some of the lovely sharp and accurate details. Thanks, John