I would recommend printing it in ABS/PETG to prevent the exhaust side from warping.
When printing there are no supports required for either model.
The attachment side for the window is designed to take M6 bolts.
Here are a couple links to the pool hose used in my setup.
*Male end: 40mm tapered to fit a 42mm Female end
.STEP files included.
The author marked this model as their own original creation.