Bulkhead fitting for extracting dust from inside an xcarve CNC enclosure. The external/outside connector mates with the 43mm (1.69 inch) diameter quick release mechanism on the Dewalt shop vac. The internal/inside connector mates to 2.5inch flex hose.
The scad script could be used to create any sized adapter. The "reducer_inside_d" can be used to taper one of the adapters to avoid creating a "step" which could inhibit dust/debris flowing.