This is a calibration test for your printer. It's made to test the tolerance you can achieve.Download the SCAD file to change the parameters. The parameters are available at the top of the file in the configuration variables. The uploaded stl file has 0.2mm and 0.4mm tolerances. the smaller tolerance (tolerance2) is marked by the small cylinder. 1: Set your variables 2: Slice the file 3: Print it 4: if the parts stick together, they didn't clear the calibration.