UNI POSCA stand for 7 3M and 24 5M markers

Printing in normal orientation works great as long as you have good adhesion. No supports required. Brim recommended just in case.

I have included 3mf for painted seams and backwards orientation with rear seam alignment to minimize seam visibility. Please use this file at your own risk, as it might bring in some other printer-specific settings.

I used 5% Gyroid infill.