printing with bambu's own petg hf. Have the boxes in use for only a few days now but they seem very strong. I do not think pla would make a good choice for this print. Petg though makes it nice and strong. Added ironing to upper surfaces and man, almost at production quality! Had a few spots where a line underextruded. Gotta take a look at that. Very happy im making multiple of them for both myself and my father. Thanks!!