Let your dad know how much he means to you... in Cooper Black... in plastic.
The STL is 2mm thick, so when I printed at .27 thickness, I got seven layers. The base is 1mm and the raised border and letters are 1mm- I manually changed the filament during a pause after the fourth layer. Have fun with color combinations.
We wrote on it with a Sharpie, but it did bleed a little bit in the plastic seams, so you might want to try writing on it with a paint pen if you have one.
I think you'll get the best results printing with 100% fill with 1 shell.
Dimensions: 60mm wide x 100mm high x 2mm thick