|Monthly Tech-Tip |
This is a product of a casting-jiggering project I did in 2019 to recreate a 1960s Medalta Potteries mug. The first step was drawing a profile in 2D (using Adobe Illustrator) and then working with a Fusion 360 freelancer at Upwork.com to create a quality 3D drawing. 3D printing this mock-up was possible after that, using my favorite 3D slicer, Simplify 3D. The mug was drawn "parametrically", that is, measurements and geometric relationships were built-in such that changing contours and the size preserved the original design. The first production mug, made about a year later, is on the right. Molds were scaled up 10% from this mockup size so that final pieces would be this size, however the firing shrinkage of the clay turned out to be about 12%.
These molds are 3D-printed from PLA filament. They are part of my 2019 year-long casting-jiggering project. A quick soaping, 164g water, 236g plaster and a fifteen minute set produced this plaster mold. It takes time to learn how to soap the masters properly to get optimum quality, but these molds seem to work well regardless. The two halves mate with a tiny amount of play, but it is easy to line them up perfectly (the play actually enables lateral movement that aids in releasing the handle). It is actually easier to cast handles solid rather than pour the slip out, they can be ready to apply in an hour after pouring. The ease of making these molds puts slip casting within much easier reach for potters and small companies.
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.
2019 Jiggering-Casting Project