I wanted to have a single part for the 3D flying bear lasermans air duct on the head. The stock duct comes as 2 pieces that require extra screws for disassembly. I placed a hole in the side for air assist if others wanted to go that route. It is the same height as the original, so the same focus plate can be used. I've included the f3d, Step, and 3mf files. Printed in PLA-CF with Bambu brand support filament. Supports are fairly easy to remove from inside of tube, just run a piece of wire through. That worked for me anyway.