Had a broken one that came with the Hot Glue Gun, so I made my own.

No Post-Printing task required.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/egFM5FYa4X6

From my experience, when printed in the size given in the STL a height of 1.8 mm is the best to fit and hold in the lock position.