3D PRINT SETTINGS
For a watertight result, make sure your printer is well calibrated and lubricated.
Then, increase the wall line count (permiter walls) to at least 3.

Resolution (layer height): 0.2~0.3 mm or less
Wall line count (perimeter walls): at least 3
Infill: as you wish (can be printed with 0% infill)
Build adhesion type: None
Supports: None