These threaded inserts can be used to repair the toy rocket model by ZoomBroomToys which I found break easily when the rocket model is printed with 25% infill.

General Notes:
I printed the original model at 50% scale. If you printed the original at a different scale, you'll need to adjust for this in your slicer.

Printing:
Print with the threaded end down to remove any support requirements.
I printed at 50mm/s to ensure accuracy of the threads on this small part.
Print time is c.30mins per insert.

Installation:

1. Drill the receiving (non-threaded) hole of the broken thread to a diameter 16mm and a depth of at least 10mm.
2. Screw the insert into the next stage and run some glue around the base of the non-threaded part before locating the two piece together and un-threading the upper stage.