Customizable knobs with the name of your children.
You can print them by changing color to enhance the names. In this case, I have added the code M600 to make the color change, at the height of 14.2 mm.

To fix them, you can directly screw an M4 screw.
I leave some stl of models that I have made for friends and family.
I also add the nameless knobs to be able to make new ones. The depth of the letters is 1 mm.
The author marked this model as their own original creation.