Print the flag halves flat and add a color change before the skull starts. When finished, glue the two halves together so you have the skull on both sides.
With a 0.2 mm nozzle, the resolution is much better. The one in the picture I printed with 0.4 mm.
The flag pole is printable but very flimsy. I printed it with a brim to keep it stable and adhered to the print bed. Print it upside down because there is a slight chamfer on one end!
Alternatively you could use a 1,5 mm metal or wood rod or a toothpick or whatever fits.
Finally combine (glue) the flag to the flag pole and you're done :)
If you want to cut the model yourself, there is a complete one-part-model aswell.
Arrrrrr, Happy Printing!
Credit to the SVG skull tempate I used (unmodified): File:One Piece Jolly Roger.svg - Wikimedia Commons
The author marked this model as their own original creation.