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See supplementary material at https://doi.org/10.1122/1.5054648 for additional details regarding the design of the in-line rheometer components, validation of the volumetric flow rates calculated by the pulses from the stepper motor and encoder, additional equations and analysis for calculating entrance pressure effects, and the shear heating analysis in the FDMRheo. The final, corrected viscosities are tabulated to compare the values from the three rheometers. The raw data of the equilibrated pressures, shear rates, viscosities, etc. are also tabulated in the supplementary material. Supplementary raw data, including the transient pressure, voltage, shear stress, shear rate, viscosity, and temperature, are provided in individual raw data files: HIPS 225C 1_72mmL, HIPS 250C 1_72mmL, HIPS 275C 1_72mmL, PC 250C 1_72mmL, PC 270C 1_72mmL, and PC 290C 1_72mmL. Note that these files are only for one of the two tests at each condition for the 1.72 mm length nozzle tip; the raw data provided contain data every 8 ms (data were collected every 4 ms) to reduce file sizes. Two sets of time data are included in each raw data file; “Time” refers to the time for the pressure, voltage, shear stress, shear rate, and viscosity data, while “Temp Time” refers to the time for the nozzle temperature data, which is collected at a slower rate.