Impossible Puzzle

thingiverse

To ensure a successful print, you must momentarily stop the process at 15 millimeters to carefully insert two metal pieces, each measuring 2 by 20 millimeters, which have been cut from round nails into precise sections.\r\nYou also have the option to pause the printing operation at 18 millimeters to add additional weight if desired, utilizing four bolts that have been strategically placed.