Lasercutter Fume Control printed adapter flange

The chinese laser cutter came with the parts, but of course, not the right size. A 6 inch tube would not fit onto an 8 inch adapter, or the 4 inch hole in the middle. Where am i going to find one of these? i print one of course! one for the other end, using the original 8 inch flange, a bit of gaff and my laser can safely cut all kinds of plastics without killing me softly! YAAAY!