This model is a Cleaning Challenge Device, to be used as a benchmark for evaluating the cleaning procedure for 3D printed objects. The Cleaning Challenge Device consists of a cylindrical base station with four holes, and four separate inserts. The inserts have a circular or square cross-section of varying diameter, which have been chosen to be both realistic for (industrial) printing and challenging for typical cleaning procedures. The distance that the inserts can be placed inside the holes is a measure of the cleaning efficacy, since any remaining dirt will prevent the inserts from sliding in completely.Step 1: Print the base station and the four inserts, at highest resolution. Step 2: Clean the base station and the four inserts using the regular post-processing cleaning procedures. Step 3: Place the inserts into their respective holes in the base cylinder. Use the engravings to read out how many millimeter the inserts are able to move into the holes, which corresponds to the maximum depth that can be cleaned with your cleaning procedures. The maximum depth is 10 mm.