Do the add-on noise reduction boards (variously called Schottky diodes, flyback diodes, noise filters) installed ahead of the stepper motors really improve print quality on FDM printers? I installed them on X and Y axes and can see no difference.
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Flyback diodes aren't there to improve quality. They are there to )protect components the stepper connects to when the stepper stops. Motors store energy in inductors, and when power is dropped that energy goes back into the source driving them, which can damage equipment. Modern stepper drivers typically already account for that and are designed either with such diodes already included, or use a design that doesn't require them.
If anything, it might HURT performance with some drivers, as described in the article TL-Smoothers, Do They Make Sense?
