Since bayonet mounts (“twist lock” or “click lock” in 3D printing slang) allow for a precise position of the closed lid (in contrast to a screw that can be fastened a bit more or less), I thought I should try a square base shape, even make a cube box. Then I added some nice wavy decoration, and here it is :)

The bayonet mount features an anti-creep compliant mechanism (to put some cool buzz words here; it just involves some springy elements that are only shortly under stress when opening or closing, but not when open or closed).

There are 3 sizes included; if you need a different size, ask in the comments, and there's a good chance I'll upload that.

Printing: Nothing special, no supports. I used a 0.4mm nozzle and 0.2mm layer height, but other values probably work. 

I used Prusament Marble and Prusament woodfill linden; I do not recommend the latter for this model since it lacks quite a lot of springiness, though it looks and feels very nice :)