1.75-inch Vacuum Hose Adapter for Harbor Freight Hercules 12-inch Miter Saw
This adapter slides right on the saw's outlet port and allows the hose to fit right over it. It might even fit other saws.
It doesn't stick out behind the saw like other adapters because the vacuum hose slips right over the outlet port and adapter. This compact design also minimizes print time and material.
Please note that both holes are tapered slightly to create a good fit. I've found I don't really even need to press the hose on hard at all.