Because grandma’s China should have your actual grandma in it…
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We have a ceramic resin for the formlabs, everyone is welcome to use it.
This looks like a modified application of 3D printer lithophanes. In contrast* to a light-based lithophane where the thinnest areas let through the most light, in this case you’d want to use a negative, as the thinnest portions would be the deepest/darkest.
*No pun intended.