Hi!
Chillum, 18mm diameter entering (for bowls/other accessories), 150mm long.
Please do NOT print any bowls unless you know what you are doing/don't care about your heath.
Doesn't require any supports, print with material of choice (I recommend PETG, PLA can bend under not that high temps so when you leave your waterpipe on the balcony or somewhere hot, I'll bend. But it does work (I personally use it).