This model is for two sizes of hoop earrings, either 3.5 inches or 4.5 inches from the hook to the bottom circle . The base and the hoops are 3D printed, you'll need two earring hooks (your choice of color). I print these at .2 layer height with an initial layer height of .2mm
After printing, open the base up and insert the small jump ring first, followed by the largest ring, down to the smallest. If you're using a build plate with an effect, make sure the circles are oriented in the proper direction, facing out. Once they are in place, secure it closed with the small rectangle. Depending on settings / filament, you may have to scale down the small rectangle by a couple of %. I tried to find the average of filaments for size. Finish by adding your earring hook of your choice, to the jump ring at the top.