This is hollowed out, and the interior does not need to print with supports, just the wings and other exterior pieces. See the video for more detail. The hole in the bottom is 34mm and will fit a standard #7 stopper
Printer:
Flashforge Creator Pro
Rafts:
Doesn't Matter
Supports:
Yes
Resolution:
.2mm
Infill:
15%
Notes:
The inside of this does not need supports, just the exterior pieces.