I am back with the actual results:

download.png

I ran the exact same GCode with M221 and M592 enabled and measured all prints again.

There seems to be an effect there, at least the 10-30 mm/s range does look flatter to me. But it is hard to say anything definitive compared to the measurement noise.

On the other hand, if 90 mm/s print speed (~10 mm³/s flow rate) is a hard maximum for the V6 hotends increasing the extrusion rate should not really do anything there. So maybe my calibration routine is somewhat flawed.

@shadowphile said in Where to start with a comprehensive extrusion calibration?:

that helps keep calibration from turning into a exercise in OCD behavior

That's a good observation. At some point we also need to recognize the FDM in general has limitations when it comes to print quality. Similar to the situation with dot matrix printers in the early days of desktop 2D printing.