50x50x1 mm calibration cube

Used to calibrate E-Steps, extrusion width and 1st layer height.
This is a 50x50x1 mm cube that I use to see the whether 100% infill is working- whether its extruding too little or too much or if I need to change the extrusion width in Slic3r settings. Also test 1st layer height to see if it is sticking to the bed