Viscosity the amorphous polymers

Hello! I am looking for the apparent viscosity values ​​at the melting points of the ABS, PLA and PETG polymers, which are most used in the production of 3D printing filaments. I would like to calculate the theoretical flow and pressure for my project, considering the Newtonian fluid and the linear pressure variation. Is it possible to get the results this way, or are there other ways that I can't find?

Thanks in advance!

... as the melting points and viscosity are highly depending on the (secret) additives, I'll expect, that you have to do the measuring for every material on your own

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