The whole thing is the cookie container (it is a buscuit variation that come in these cardboard-containers, where the bottom is an aluminum plate and the lid is made of really thin plastic). I removed the first layer of cardboard (which was the lable), spraypainted it white and did a laser engraving on it. and to make it more rigid i made this 0.8mm think inlay from PLA that also stiffens the top-edge and holds the lid.

oh ok, that (and the subcomment to this one) sounds like a solid way to go. I will reconsider :) thx :)

good to know :) thx 👍