I saw this on Instagram the other day and decided to do it as a 3D printable little thing.

This is a magical illusion by flipping this little tile with an arrow . When flipped on one hand by holding it on two opposite corners, the arrow will point on both directions, up and down. When changing hands and holding the tile on the opposite corners, the arrow will point only on one direction. 

Show it to your friends, they will go nuts!

The trick:

The tile has an arrow on both sides but facing different directions. That causes the optical illusion when changing hands. On one hand, the arrow will point up and down, and on the other hand, it will point the same direction. 

Filament colors:

Very important to use a dark filament color for the tile and a light color for the arrows. If done the opposite way, the arrow will be seen through the tile and people will notice it. 

Printer settings:

On Bambu lab, check "Split compound and compsolid into multiple objects" when bringing the model to the bed.

Nozzle: 0.4mm

Infill: 15% gyroid

AMS lite (A1)