100mm dimension calibration tool (aka Califlower)

Tool that can be used to calibrate the dimensional accuracy of the printer in the x and y axes by calculating the average of the dimensions taken internally and externally. Inspired by the movie from Stefan (@CNCKitchen). Original Califlower here: https://www.printables.com/en/model/682023-califlower-calibration-stl-calculator by @AdamVector3D