It was glued down using the casting slip itself (it stuck in seconds). About ten minutes after draining a fettling knife was run around the inside, then it detached easily. The overhung lip produced imparts structural strength that resists warping, for drying and firing, to the thin walled piece. This spout has advantages over the traditional "spare" built in to the upper part of a mold. It enables a one-piece mold. The lip can be more overhung. Draining is cleaner and easier. Molds are lighter. Extraction can be done sooner and it is easier. The spout does not absorb so there is less scrap. The degree of overhang is adjustable by simply printing new spouts.
This is another example of the flexibility potters have compared to manufacturers. These 3D-printed gizmos are stuck on to hold the mold halves together. The casting slip itself adheres them. Dipping the flat surfaces and attaching them takes seconds. The 3D printed pouring spout is likewise attached using the slip (it also helps hold the mold halves together). Another feature: There are no notches (the halves were poured into disposable 3D printed PLA masters - and mate perfectly). Initial use of a rubber band to hold them together was not ideal because realignment of the halves damaged the inside corners. By using this method the mold halves can be aligned accurately. These three things are great for potters. They simplify mold design and production, reduce mold size, improve the fit of parts and simplify pouring, demolding and cleanup,
Standard 3D printing technology (not printing with clay itself) is very useful to potters and ceramic industry in making objects that assist and enable production.
A method of forming ceramics where a deflocculated (low water content) slurry is poured into absorbent plaster molds, forming a layer against mold walls, then poured out.