The text is a separate object and can be edited to be whatever text you want, and whatever size. The current text I liked to go with my set up, and the size is the biggest I have found to properly fit on the button without being cut off.
If you try to rearrange these buttons the text may lose placement on the button. If this does happen, or you experience the same thing I did when changing what was written (i.e. B1 to C1): the z may shift. If it shifts the Z for the text object needs to be at -11mm to be flush with the main face of the button.
I printed these in PETG to match my hydra, and the colors are just my preference in my steampunk esthetic.
I will work on the design more and see if I can keep this from happening for a future update.
The author remixed this model.
I remixed the original model to have letters and numbers on the button instead of the Bambu logo. The remixed buttons would have B1, B2, B3… etc.