Mason Jar Bubbler
thingiverse
I design a custom bong for any wide mouth mason jar. I print it with no support, and it comes out great except for one small spot under the mouth part. I use an 18mm downstem like this one: https://www.amazon.com/GLASS-18MM-14MM-DOWNSTEM-STANDARD/dp/B071RLF99V/ref=sr_1_14?ie=UTF8&qid=1501115750&sr=8-14&keywords=18mm+down+stem If you want to do dabs or have space issues, I recommend a drop-down like this: https://www.amazon.com/Dropdown-14mm-Male-Female/dp/B01C7MJBWG/ref=sr_1_2?ie=UTF8&qid=1501116050&sr=8-2&keywords=14mm+drop+down
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