Material Viscosity parameters

[Grogyan]

The specification includes SLA viscosity, however 3d printer filaments have a viscosity curve and coefficients that determines how well it will print. Useful for slicers to adjust printing gcodes based on the viscosity of the material.
Even the dye(s) used between the same material,. Eg PLA can have a noticeable impact on print quality as the viscosity coefficients differ

Please add for filaments, viscosity parameters, such as the viscosity curve and viscosity coefficient

[CZDanol]

Hello, the OpenPrintTag format is intended to work as a simple "field: primitive value" pair list. What specific fields do you propose to add, and what would be the units?

[Grogyan]

Fields I propose are
Viscosity Coefficient - SI unit of pascal-seconds
Viscosity

Viscosity Shear Thickening - Dilatant
Dilatant

There may be others that are useful

[Grogyan]

Pressure advance or Linear Advance, depending on the firmware is an open loop rough guide to compensate for the varying viscosity, these are an approach to maintaining viscosity of a hot end extrusion.
In many cases this approach is good enough, however if slicers included viscosity parameters which are unique to the material, filler, dye(s) etc, better and more reliable extrusion can be attained

[CZDanol]

I believe that the viscosity coefficient is dependent on the temperature - so could we really make it just a field with single value?