Well the original purchase was for the flower pots and to just try this brand.. boxes cam afterwards when the cat was playing with all the things on my desk.. I also don't like PLA:-( For boxes like this, I am sure PLA would be fine but not sure how well it would hold up at wall thickness of .8 or 1.6mm as that is what these are. I will have to try some PLA just to compare before I have to swap out the big nozzle.