Getting the glaze to lay flat and remain glossy has been the most tricky part of the whole 3D-printing ceramics process. When I apply too little glaze, it leaves a matte surface. Too much glaze causes it to pull away into clumps. The perfect, unform glossy goal is a narrow range! I’ve so far tried dipping the pieces into glaze, and brushing it on. Surprisingly, the dipping method is more difficult to control since the glaze is very viscous (I should probably thin it) and doesn’t drain off the part uniformly. I think spraying the glaze with an air gun is the way to go, but I haven’t tried it yet. I believe spray application is what’s used for commercial dinnerware, etc. I’ve been using Amaco Celebration high-fire glazes. The colors here are Baby Blue, China Blue, Orangerie, and Light Grey.
I admit that I’ve been in a hurry for the glaze to dry before firing, and have used a heat gun to speed it up.
I added a 2mm hole into the .stl to prevent air entrapement when printing with the open end facing the tank of resin. These vases were actually printed directly on the build plate, and the bottom was pulled apart when trying to unmount the object from the plate. I’ve since started using supports to print vases like these (but only on the base - no supports on the sides), and that has worked very well.