I use pint glasses for my coffee, but they get awfully hot to hold. Many coffee places have cardboard jackets that you can put on your cup to insulate your hand from your hot coffee, so I figured I'd make some reusable ones for my pint glasses. I printed them in flexible filament so they would stretch a little and stay on the glass.

The STL included fits all my pint glasses, but in case yours have different measurements (or you want it thicker or bumpier), you can Customize one to your specifications. The OpenSCAD design lets you control the height, top and bottom diameters, size of the insulating bumps, and the overall thickness of the jacket.