Summary 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 Print Settings 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. How I Designed This