No support needed if printed with the pattern facing downwards. 

Just keep in mind the bridges in 1.2 mm height. 

Alternatively you can print the case face down with support on the inside. This will give you a better looking finish. 

I recommend using PETG as it has some more strength.

I uploaded BGCODE for the Prusa Mini and a 3MF file for convenience. The color change is also included.

Happy printing :)