Simple "Magic" Box

ATTENTION:Please use a calibrated printer / calibrated filament for this! Otherwise it may not work properly. The red boxes have 0.075mm tolerances at each side and 0.15mm at the top. The surrounding box has 0.15mm tolerances at each side and 0.2mm at the top. Increasing that size would make the trick work less as the inner box would move and anyone could see the trick directly! If the print is not working for you then please first maintain your printer before leaving a bad comment / rating!----