Here's a quick test print I've designed. I inspired myself with the shape of the benchy. The idea is to test the overhang, the bridging, the stringing and the clearance. The tiny part in the middle is supposed to be able to rotate. It does not use much filament and can be stacked to display. It looks better than some calibration cute laying around.

The design is stackable.

Takes less than 30 minutes to print.

Let me know what you think of it and Happy printing!