I was tired of cleaning the trap in a sink with no drain plug. All sorts of things get dropped in by accident, not to mention the multitude of hairs. This plug went through 3 revisions to allow decent drainage, while keeping the majority of debris from being sucked into the void. My drain was 1 ¼" with a taper after the opening, the tightest tolerance is not necessary here, so there is a slight amount of room to spare. The actual insert to the drain measures 30mm.

Also included is the gcode which I used, It is set up for overture white PETG, and has reasonably removable supports.

I do recommend printing this PETG for resilience and cleaning sake, and printing it upside down to minimized supports.