sewage ventilation hood (Lüftung Abwassertank)

I found the prices for a ventilation hood for an underground sewage tank relatively high so I decided to print my own. It is meant to fit on the standard DN 200 interface.

I designed it in a way it can be printed without supports. However, buildplate adhesion is pretty bad due to the big chamfer on the bottom. So I recommend added 6-10 rows if brim to make the model stick better to the buildplate.