Dear Hookah Friend, i  was working on a Hookah since 3 years and get lots of different designs. This is my Joker hookah. You have to put a bullet like a glass sphere (7mm) in the base while printing. You can also testing a printed bullet if your printer is really accurately in printing round figures. I am using a stainless steel rod (14mm diameter) as a dip tupe. My rod goes through the hole joker pillar and ends in the water o the bowl. You can also try to use a printed dip tupe. At the top of the pillar there is a place to put a magnetic ring on for holding a metal plate. It is designed for a magnetic ring in the demension 27x21x3[mm]. The hole printing time is round about 30-35h. The bowl is printing with a  .8 nozzle (.25 layer height). The rest should be fine with a  .4 one. With this offer you will get 2 pillars as you can see on the photos. Next to the joker pillar you receive a "normal" spiral pillar. too. Both fits perfectly to the base which is locked by a bayonet mount. If it's not capable for you to print waterproof bowls you can send me a message on my instagram account (CreateSmoke) for buying a printed hookah with a magnetic plate and black or white tupe.