Drip irrigation goof plug

Ah, the humble goof plug. No matter how many bags of these I buy, they are never to be found in my irrigation repair kit when I need one. With the current water shortages and neighbors encouraged to rat each other out at the slightest spurt, I need to stay on top of the inevitable weed-whacker mishaps.
This prints best in batches of 12 or more. Very quick to print. These should fit the standard 1/2" or 5/8" drip irrigation tubing with holes punched in it (common US size). They require a bit of