Watertight 3D Prints
1 Go Slow
Pro tip: do not print on high speeds. Like basically ever, prints are always more accurate when printing on slower speeds. The main goal is to make the wall as dense as possible. So if your printer isn’t extremely heavy to provide the required stability, the vibrations that almost all printers produce at higher speeds will not allow for a watertight result.
2 Highest Temperature
To ensure a proper bond between the layers, print out your favorite design at the filament’s highest temperature. You can even increase it by 5C as the layers can melt together even easier.
3 Low Layer Height
When using the most common 0.4 nozzle, it’s best to print with a 0.15 mm layer height, or even go down to 0.05 mm. In our experience, thin layers adhere far better than thicker layers.
4 Forget the infill
Always print all the layers of the bottom without using infill without risk of gaps. Use a classic linear pattern that overlaps the individual layers.
Increase the Flow (Cura) or Extrusion Multiplier (PrusaSlicer) to 105-110% to ensure there are no gaps between the perimeters and layers. This won’t change the look of the design, but will gain waterproof qualities.