Dewalt dws780 Zero Clearance Throat Plate

It's 2 halves so it can fit the pinter, designed with a lap joint that the center screws pass through both pieces so stays aligned and solid.

The added modifier is to have the saw kerf area of the print with 100% infill, so when you make your initial cut it'll be solid, instead of having voids from the infill of the rest of the print.