Under the stl file is a 3mf file for Bambu Studio.

Using a site like Tinkercad, you can easily add your own words onto this.

To change the text in Bambu Studio, press on the objects button, then select “text_shape”. After that, then press the Text Shape button next to the Color Painting tool. From there you can change the text size, font, and what the text says.

If you are without an AMS, put a pause at layer 18 so you can switch colors.