Quote Originally Posted by wirlybird View Post
Here is a good blurb on it:

So, you know no that sailfish is not an option, that doesn't mean you cannot calibrate.
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these variations in hardness. For example, ABS is significantly softer than PLA and so significantly different adjustments may be needed for ABS versus PLA. This will, of course, depend upon the geometry of the pinch gear and how capable it is of biting into the filament.
Thank you W, that blurb makes a great deal of info fall into place. Particularly the part about the hardness of the filament changing the geometry of the pinch gear system. Obvious once you understand...