This is super dope, what a fantastic idea and good execution. Well done!

House of Leaves by Mark Z. Danielewski fits that model really well.

I think this is at least tangentially relayed to what you’re asking:

https://en.m.wikipedia.org/wiki/Liaison_(French)

Edit: Actually this might be the exact opposite of what you’re asking…

I remember reading something that matches exactly what you’re saying above. The material is food-safe, but the geometry is not.

So 3d printing a cup, plate, or measuring cup is not recommended, but the cutlery insert OP is describing should be fine, no need to coat it.