This Instructable is going to show you how to make a 3D printable drink holder on 123d Design ( http://www.123dapp.com/design ) that drastically decreases the chances of your drink tipping over, acts as a coaster, and can be washed.
Now, the attached is an stl. file of the holder I made (No, the poorly made soda can isn't included). It will fit drinks with a diameter of 7 cm or less (most soda or beer cans, bottles, and cups). You can download mine, or If you want to make a larger or smaller holder, I'll leave a formula at the end of this Instructable so you can plug in your own measurement, get the angles right, and have a holder that's to scale when printed!
First thing is first, download the desktop version of 123d Design at http://www.123dapp.com/design, open a new project, and change your unit to cm if it isn't already!
Step 1: The Base
1) Create a circle with a diameter of 13 cm
2) Extrude the circle up 0.5 cm
3) Move the shape and delete the original circle from underneath it