Toothpaste Squeezer

As most of these designs are too narrow for AUS tubes, I had to make my own.

There are no flexing parts that will break over time, the key is held in place by the torque from the tube wanting to unwind. This makes it grip more and hold the key in place.

Printed on my X1C the parts that fit onto the key are quite tight, mine did not needed any glue.