Bone Dome - Bong/Flower Vase

prusaprinters

DESIGN: The design was intended to be a flower vase that allows you to pour in the water without removing the flowers. I've come to discover that this can very easily be modified into a smoking apparatus, so I've included the instructions as I've seen them.PRINT SETTINGS: These are the settings I used to create the example in the heading image. I tried to provide a slight texture for applying the epoxy resin and these settings seemed to produce the optimal texture and hid layer lines with the matte appearance.4 Walls30% Cubic InfillFuzzy Skin:Contour0.2mm point distance0.17mm skin thickness0.2mm Layer Height (I used adaptive and it turned out great. Just try and smooth the auto generated adaptive layers to prevent banding.)Supports are not neededSAFETY ADVISORY: There has been controversy surrounding FDM prints and how well you can clean the bacteria that may build up in the layer lines. I've included sources, but I did the research myself and here is a summary of what I've discovered.FDM prints DO produce pockets in which bacteria can grow. On the flip side, FDM prints are also capable of being adequately cleaned. The article below describes the effectiveness of cleaning FDM prints. It was published by the IEEE, duplicated in several labs, and verified several times.The FDM process is not considered food safe by the FDA due to the hardware used in the process; however, an epoxy resin clearcoat is food safe and provides many additional benefits. Epoxy resin is typically capable of withstanding temperatures up to 300F intermittently, it's water tight, it's very chemically resistant (See the engineering toolbox chart below), and looks great. For FDA approved epoxy resins, look for the FDA 21 CFR 175.300 approval. Many recommend Alumilite Amazing Clearcast, which is commonly used to coat tumblers, mugs, tables, counters, etc. It can be found fairly cheap on Amazon.For chemical resistance, I found that epoxy resin is capable of withstanding a wide variety of chemicals. The list of chemicals that epoxy resin is not resistant to is fairly small (Acetone, Bromine, Fluorine Gas, Hydrobromic Acid, Nitric Acid, Sodium Hypochlorite), while the list of chemicals it is resistant to is long. Chemicals epoxy resin is known to withstand well include (But is definitely not limited to) beer, isopropyl alcohol, amines, ammonia, butane, citric acid, gasoline, kerosene, jet fuel, most oils, urine, vinegar, distilled water, salt water, fresh water.Article on the effectiveness of cleaning 3D prints: https://www.researchgate.net/publication/373174194_Sanitation_Effectiveness_of_3D-printed_Parts_for_Food_and_Medical_ApplicationsChemical Resistance Chart: https://www.engineeringtoolbox.com/chemical-resistance-epoxy-d_786.htmlSMOKE INSTRUCTIONS:  To turn this into a smoking apparatus, you'll need 3 items. A downstem, a rubber grommet and a bowl with a heatbreak. It should fit any down stem with an 18mm joint and approximately 100mm in length. You won't get a good seal and proper thermal isolation without a rubber grommet though, so select wisely. Most shops local to me have them, so I can only assume most shops in general have them on hand.The reservoir has a slight edge on the back. When a vacuum is applied, the water tends to roll to the back then up, so this deflected it enough for it to fall back into the bottom.Happy printing and enjoy!