These potion bottles are designed to print in “spiralized” mode to maximize translucency. Download includes five style of potion bottles and two styles of interchangeable stoppers.
See here for video: https://youtu.be/VfkuHpC554M
Be sure to print the bottles and stoppers in spiralized mode with a bottom floor.
The fit of the stopper in the neck of the bottle depends on the size of nozzle that you are using. This design is optimized for a 0.5mm nozzle. If you are printing with a smaller nozzle, you may want to scale the stopper up slightly to ensure a snug fit.
When printed with good filament and printer, the “Diamond,” “Hex,” “Triangle,” and “Plain” bottles are watertight. The “Square” design is trickier to get watertight because of the overhangs.
The top rims of the bottles and middle rims of the stoppers have tiny radial slits that create a toolpath that traces back and forth over itself creating a stronger and more watertight surface than you would get otherwise.
See here for a similar test tube design: https://than.gs/m/988494
Looking for potion bottle designed for resin printing? Try these: https://than.gs/m/1009906