6-inch Double Wye (pants wye) for PVC Dust Collection System

thingiverse

Like a lot of woodworkers, I'm using PVC plumbing pipe in a central dust collection system in my shop. One drawback for this type of pipe is that the fittings are not designed for upwards of 1000 CFM air flow, and will introduce significant pressure drop to the system. Additionally, once you get up into 6 inch and bigger sizes, the fittings get expensive. These factors led to designing and printing my own fittings for the DC system. Blast gates, elbows, and wyes. I tried to design these to minimize pressure drop, and to fit the PVC sewer & drain pipe directly, without additional adapter fittings. The fewer fittings, the better for DC performance. In my system I ran one main 6" duct across the ceiling between two I-joists, and needed to make a hard turn in two directions at the other side. I could not find a 6" fitting that would work well, so designed this to use along with two 45 degree elbows. I couldn't fit the whole part into the build volume of my printer, so I separated it into three parts and glued them together after printing.