Surprisingly Stackable Set of 6 Support-Free "Potion" Bottles for Physics and Math Exploration

Fun inside and outside the water! These bottles have openings big enough not to trap any fingers. The different shapes and sizes along with identical spouts make them fun to stack in different orientations and see what will balance.

Each bottle has a volume between 150 and 160mL so kiddos can learn how different shapes can still have the same volume; that a tall bottle can fill the same amount of space as a squat bottle.

Pictured pyramid, star, and donut/torus bottles are printed with a slightly older model. The pyramid and star bases as well as torus arch have been adjusted to improve printing results.

Printed with a .16mm layer height.