This is a four part 3D printed bong that i designed myself. Each part screws together. It also includes a lighter holder designed to fit a standard sized clipper lighter. It takes a 10mm metal downstem with a hole designed to fit the standard gromits that come with the metal downstems.
It was orginally desgined to print on my Anycubic I3 Mega but i have since been printing it on my CR 10 without any issues.
The base has to be printed in 110% extrusion or flow in Cura to ensure that it is watertight.
I used the little rubber mouthpiece off of a balloon at the top of the thread to ensure an airtight seal is made, but alternativly PTFE tape could be used for a similar result.