Neat retro looking planter with a triangle texture
Printing in vase mode alows you to print quickly as the planter will be printed as one continiou...s layer. Use (at least) 4 bottom solid layers to ensure it is watertight.
The STL is solid. Don't worry, once you slice it in vase mode it will become hollow.
Printing slow will allow for sufficient cooling to avoid sagging
Printing with a 0.4mm nozzle is possible but bigger nozzle sizes will give you sturdier prints