I will look into this filament as it sounds interesting to use. I'm not sure that the lines are a big issue for ceramics though. There is a certain amount of smoothing that occurs with glazing etc, but it would be interesting to try for sure.
My issue with stamps so far is more in my design. I did not make some of the forms as deep or crisp as I needed, so I'm still working on refining my 3D models before they get printed. I'm sure it can be done. I have to just tweak some settings in trial and error.
I would also love to see more of your daughter's work. I've visited Moore Coll