Tired of waiting to print a full 20x20x20 cube? Just print this shorter test cube/block instead. Its only 4mm tall and have fine features/text to determine if your printer is printing properly and having enough cooling. The printer should be able to print the text clearly if its set up properly with a 0.4mm nozzle. The thin walls also provides additional testing to determine if your printer is set to print thin walls properly. Total print time is less than 4 minutes with my typical setup and it allows me to tweak the settings much quicker than a standard 20x20x20 block.