slip casting - next level pottery

[Booker42]

Slip casting allows you to quickly make multiple identical items, so how to do this.  Maybe make a box, place the fired clay item in it, pour in plaster (quicklime, sand, and water) and let harden. This will make the mold. In the future you can mix clay and water in a bucket or barrel and pour it into the mold. Let it dry, and then fire it.

If you want to get more complicated you can use fat as a mold release, and you could maybe even cast carved or chiseled items

[skam]

This may be able to  solve the repetitive operations that come with mass-producing pottery in the late game. 

[StCatharines]

I know there's a mod which allows exactly this...

Found it! Clay Casting is the mod.