This tolerance test is adjustable not only for tolerance, but for diameter and height. Trying to find slicer parameters to make a given tolerance requirement? These print in less than a half-hour at 0.2 mm layer height and default dimensions. The hexagonal shape is easy to grep in your hand or with tools, while the central "puck" can be broken free with a hex key or one of those screwdrivers with interchangeable bits.