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I saved the CAD files out in the "Thing Files" See the two zipped folders. One is labelled printer. The CAD files are for a program called Cubify Invent. It might be similar to Alibre.

As the solid filament enters the 3D printer extruder heated barrel it liquefies somewhere in the extruder barrel before coming out of the nozzle. It is at that transition point (right before it melts) where the filament cross section acts as a piston and pushes the liquid plastic in the barrel and out the nozzle. The cross sectional area of the filament at that point is effectively the size of the piston and so is the key variable we want to measure. My guess is that this occurs somewhere in the middle of the barrel before the nozzle tip.