Calibration Cube

This is a 20x20mm Calibration Cube - and its the best way to use the 20cm of filament you got with your Chinese Reprap clone from AliExpress. You can judge that your printer is printing correctly by measuring this, after printing, with a pair of calipers, or a ruler, or perhaps your pinky finger will do as a measuring device, seeing as you're the cheap-ass with a $200 printer from AliExpress.