This is my second 3D ornament. It is a print-in-place model that does not require supports. The rings should be easy to spin after you remove the print from the print bed, no assembly required! I reworked the hole for the ribbon so it would print better.
Use 0.1 mm layer heights and a 0.4 mm nozzle (standard on most printers). I also used 20% infill, though it does not make a lot of difference on this model since the features are fairly thin to begin with. I recommend using bridge settings to help the axle pins print properly.