Flow Calibration Cubes (Circle Remix)

Set the extrusion multiplier or flow ratio on your slicer (80% to 115%) and print the corresponding model. 

Look for surface irregularities inside the circle and on the circle itself. The surface must be smooth, without gaps and the circle complete.

Print it using your usual speed settings. 

Thanks to @moddok for the original model. 

Includes a SuperSlicer flow calibration style circle (0.4mm wide and 0.2mm high), making it easy to spot irregularities.