11 tests on one calibration block. Requires calipers to measure min/ max feature sizes for your printer. Recommended print fill is 5%. Metric Version: http://www.thingiverse.com/thing:423263 Tests: horizontal and vertical hole diameters 3-axis feature minimum feature width test scaling accuracy (via 1/2'' x 1/2'' x 1/2'' cube cutout) rounded feature minimum size fillet minimum size max tower height to diameter ratio Max build hangover angle test (30 - 80 degrees) minimum layer thickness Bug Fix: modified dimensions of block (excluding pillars) to 3.375'' x 1'' x 1.25'' added more text in v1.3 along with a couple extra protrusions.