Blank
thingiverse
If you simply wish to display a blank space, indicating that no color coding is desired and opting not to utilize the built-in function to generate one, then you can achieve this by including a single blank sign.
Download Model from thingiverse
With this file you will be able to print Blank with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Blank.