This is a simple plug stopper for the Miele Super Automatic CM 6 series espresso machines milk jug.

The Milk jug when in the fridge is open to the air via the tube hole, which causes the milk to go bad quickly.

A simple 30 minute printed item, 100% fill, provides and air seal to the outside world.

Disclaimer: You should use a "food safe" material, printed on a food safe machine.