Edit 2/28/2018: Added two new veio which are different, smaller sizes. Tall and Grande. Tall: 172mm Grande: 180mm Regular: 210mm If you're really looking to print the regular and you have an Mp/Wanhao i3, use these:
(extender for front braces)
(extender with rear braces) This is a gravity bong for people who want a more permanent gravity bong which prevents your house from looking like a trash keep. I can't stress enough to use PLA. It's made out of plants, not tar. I believe this is the world's fit 3d printable gravity bong but I am not certain. This is the fit model I've ever designed. Here is a working stem:
Stem is 9mm Here's everything : For this model -Cover mouth piece with hand, submerged, light and slowly lift up to draw smoke into chamber. You don't need a flame for more than a couple seconds to get it ember. Do not pull out of water at all during this. No danger, you'll just lose your smoke. -Remove stem and cover hole with thumb. Use mouth piece to inhale smoke as you descend the bong back into the water. Cough and enjoy. Edit: Slightly altered the air paths so it functio better. Mostly the same but made the base perimeter a tiny bit more flat. Edit 2: Added an alternate veion with a handle.