This print is meant to assist in determining the dimensional accuracy of a given printer and slicer software. It consists of a 20.0mm plug to fit into the 8 tolerance holes, between 20.0mm and 20.7mm. A useful tool for determining the fit of interlocking parts, especially circular holes. Remember, the value on the side is the Diameter, so if a fit is wanted to the same tolerance of the 20.4mm hole, there is a 0.2mm gap needed between the two parts.