A spring to replace the one that broke in the door mechanism. Keep in mind, a plastic spring is not as strong as a metal one, but it's still better than nothing!

If your door happens to be same model as mine, you can use this model! Otherwise, see these instructions on how to design your own: https://www.instructables.com/id/Fix-a-Door-Spring-With-3D-Printing/

Creality

Ender 3

No

0.2 mm

no