Simple sign designed to print face down. Can be scaled to your desired size. You can change colors best in the Object settings on the left of Bambu Studio. The individual Part at the top of the list is the main board. The rest are the individual letters. You can mass select the letters and change all their colors at once or you can mix and match as you like.

***NOTE ABOUT STL***

If you choose to grab the base STL file it will load into your slicer as a single object all in a single color. To fix this, right click the object and you want to break the object into Parts. Do not break into Objects! Once you've done this you can go into the Objects list and expand it. You will see a long list of individual parts. The topmost one is the main sign board. All the rest are the individual letters. You can select all those at the same time and choose the color you want your text. Make sure to verify in the Preview after slicing and before printing.