The best yarn bobbin & ball starter

This yarn bobbin is a remix of Kellbot's Original idea, so i cant take all credit.
I scaled it up so it could fit more yarn, then I reinforced the middle so it could support the yarn better, then i added the word yarn on the bottom just for fun.
I printed this using 0.03 MM layers, and 0.02 MM layers. I personally think that the outcome was much better with 0.02 millimeters, but you can use either. I would also recommend using a 20% infill.