This is a coupler for a SawStop Professional (PCS) cabinet saw. It adapts the dust collection outlet on the cabinet to the Rockler Dust Right® 4" Quick Connect since they are not quite the same diameter.
I print this as completely solid with wall perimeters set to 4 in Cura. It has held up just fine for a few months.
Printer: Ender 3 Pro w/ direct drive
Rafts: No
Supports: No
Resolution: 0.15-0.2mm
Infill: 100%
Shells: 4
Material: PLA+ or PETG
This prints fastest if you just print it as shells. This should be 4 walls on a .4mm nozzle since this is 3.2mm thick.
The author hasn't provided the model origin yet.