The lid allow to use the old food cans for storing small parts ,etc. I was planning to glue outer ring to the can but seems like it hold pretty well without the glue. I printed this only from basic bambu PETG and Transparent PETG but should work with other material. This model is fo diameter 75mm but 86mm coming soon (tuna can and others) I am pretty new to 3D printing and this is one of the first models I made so there may be lot of space for improvement.