Updated design of the output connection for the harbor freight 2HP dust collector. designed this one because the old one had been damaged, so I improved the interior to allow for better airflow (less turbulent) working on redesigning to further improve interior shape, but this model will work. flange needs to be solid if possible, i printed the first one at 40% infill and although it works, it would be better to adjust the bottom layers to the flange height, 24 layers at .2mm. the rest will work fine with some infill. no supports neeeded