This print came directly from the SD Card that came with the 3D Printer.  I did not know what to expect from this 3d print. What is a Stackable Cup?

When the cup began to curve, I didn’t if the printer had messed up or this was part of the design.

It looks like what make the cup “stackable” is the ledge inside the cup.

Yes!  It does hold water.

Print Time: 4 hours 50 minutes
Filament: PLA – 2.56 meters 20 grams
Layer height: 0.1 mm
Shell Thickness: 0.8

Object Size (W, D, H): 57.462, 57.462, 50 mm