We have a decent size dead space in our 1st floor hallway that contains our 4" b-vent ductwork from our basement hot water heater. There is a firestop where the b-vent comes through the 1st floor. In all my research, it appears that the b-vent cannot be cut and multiple 45 or 90...
It's the cleanest solution on the market for dual extrusion 3D printing. This is because the two extruders work independently when printing water-soluble supports or multi-material parts. While one extruder is printing the second one is parked, preventing the drip of molten plastic into the part...