@Monomo @freecad
To write it simple: Better don't do anything with food and #3dprint.
"No print is food-safe without surface coating"

https://blog.prusa3d.com/how-to-make-food-grade-3d-printed-models_40666/
https://formlabs.com/blog/guide-to-food-safe-3d-printing/
https://jlc3dp.com/blog/food-safe