I had so much fun re-designing the Doric Column Container that I worked up this Romanesque keepsake box.

It should print well with no supports, but I did print the one in the example photos with zig-zag at 25% and they came off really easy, but your bed adhesion must be spot-on since flat, square objects with a large footprint like this one tend to pull up hard at the corners, which can also be seen in the example print. The lid came out perfectly, however.

No hinges, no screws, just four tapered pockets in the corners of the box, and matching pins in the lid to keep it in place.