The original spiral earring was not printable on a standard Makerbot Replicator nor Ultimaker because;
- it was too small
- it lacked a brim so that the item got knocked off the heated build platform during printing.
- it was oriented sideways
I improved it by;
- increasing size to 7.62 the size of the original. This is the minimum size so that all the features are at least 0.4 mm in width by 0.2 mm in thickness.
- I added brim
- I reoriented it vertical
Print this at 30 mm/s print speed one at a time. If you print them both on the same HBP, the 2nd nozzle might knock loose one of the spirals. Carefully measure your nozzles with a dial gauge. Be sure to do all your prints that have delicate features with the lower nozzle. Nothing in the universe is perfectly level. One nozzle will always be a few hundredths of a mm lower than the other one. Use the lower nozzle.