This is the Summer Waves SFX SkimmerPlus Vacuum adapter. I also added a version that accepts an o-ring (size: R-15 recommended).
Supports are only only needed on the EXTERIOR of the intake and are suggested on the main dome. Add support blockers to the INTERIOR of the upper intake cavity and the INTERIOR of the intake spout, as the areas do not require support.
Recommend filament: ABS or ASA
Leaving post printed supports will give the part added strength without impeding performance.
The author hasn't provided the model origin yet.