Spill cup
thingiverse
This is a cup that spills if ever drunk from. Make sure to print it upside down with supports. I did not try this yet so tell me if you did. Have fun pranking your firends.
Download Model from thingiverse
With this file you will be able to print Spill cup with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Spill cup.