I wanted a taller Flush/Purge object for my multi color prints that I could resize to the height I wanted but most dragon eggs were cut half way up so they weren't maximizing the height potential. I put the threads in the bottom of this egg to utilize the full height as a flush/purge object that could be scaled to match whatever I was printing.

I added a negative part for the coin slot so it can be removed if its unneeded, and can also maintain size if you need to scale the egg up or down. The coin slot should be 27mm x 2.5mm for standard US coins. I also left the egg and threaded cap as one object so they both scale together.

To utilize this as a flush/purge object select “Objects”, then select the Dragon Egg, click the “Others” tab, then “Flush into this Object”.