Calibration Object - Pyramid - Hollow

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This version of the calibration pyramid looks at things just a bit differently. It tests X/Y/Z axes calibration, filament retraction, bridging, and accuracy.   It is intended to be printed as is, without disabling fill, since the hollows are built in to the design.  It should be sliced at 0.4mm layer height.  If you want to try a different resolution, be sure to scale the part down accordingly.  There are a pair of unusual features that occur during printing of the windows in the walls of the part.  These two features are dead-end runs.  That is, they are single-walled outcrops, with nothing to grab onto at the end.  The bridges are built on top of these, higher up, so you gotta get these right first.