USB Vacuum Pump Adapter w/ O-Ring

An adapter for a cheap usb vacuum pump commonly sold with filament storage bags. Over time the stress from holding the seal causes the manufactures polycarbonate adapter to crack and lose suction. I printed this with 10 walls to ensure it's printed as a solid body with walls only and without infill.  The o-ring measures ~ 18mm ID, 22mm OD, 2.5mm H. Throw a brim on it and print it o-ring up. If it's slightly too big/small, a lite flame and some careful & gentle persuasion can make it slightly smaller/bigger (Keep it circular!). Also, try rotating the adapter with the unit on to find the sweet spot. 

I found @MiChAeLoKGB_314289's model a perfect fit. But I wanted a perfect seal using the o-ring that was harvested from the cracked adapter. I added a small protrusion and carved out a slot for the o-ring to sit.  Now we have a perfect seal!