Here is how I make my folded hand-built mugs.
Ths method has a number of advantages.
It lends itself to automation.
It uses very little clay.
This was created by a simple revolve operation and then shelling the shape (from the top) to 0.9mm thickness.
Four of these were 3D printed and then combined to make the cutter.
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Hand built. Cone 6 drop-and-hold PLC6DS firing. The engobe is the L3954B base recipe with added Mason 6600 black stain, it was applied at the leather hard stage inside and part way down the outside. The GA6-B glaze enhances the black under it. By Tony Hansen.
Fired at cone 6. Hand-rolled and assembled using Plainsman Polar Ice. I think studies would show that drinking coffee from a yellow mug in the morning will brighten up your whole day!
This is made from 100% of a natural clay (3B) from the Whitemud formation in Ravenscrag, Saskatchewan. I rolled the plastic clay into a thin layer, cut it into a cross-shape, drape-molded it over a plaster form and then slip-joined the seams. It fires very dense and strong (to zero porosity like glass!). It holds together well and joins well with its own slip. Although not super plastic, it is smooth and fine-grained like a commercial porcelain body. I add 1-2% bentonite to make it more plastic when needed. It has the ability to be rolled extremely thin and yet does not warp in the firing! This mug has a weight-to-volume ratio of 2.08 (the weight of water it will hold compared to its own weight).
I glue four of these together to create a cookie cutter for producing my slab-built mugs. For different sizes of mugs I need cutters with different geometries. This is quarter-cutter and it has been drawn "parametrically" (using Fusion 360). That means that certain aspects of its geometry (two lengths and one angle) can be changed by simply changing the parameters (in the Parameters dialog). The drawing then adjusts automatically, it is magic! Other aspects are fixed (e.g. the right-angle, the pucker-preventing hole cutouts, the height, thickness). Parametric design is revolutionary, it fits my try-it-adjust-it-try-it-again way of working. I can label my printed parts according to the parameters, in this case 45-25-108.