We've all been there. You get a fresh cup of coffee to your desk at the office, then you have to leave your desk for a while. When you return (after maybe one Clash of Clans battle too many in the restroom) the coffee is cold.
This coaster/thermo lid solves that. Use it as a coaster to protect your desk from coffee rings, and when you leave your desk, just put it on top of your cup. It displays a clear message to your colleagues not to lose hope.
This coaster is intentionally pretty thick (the base is 4 mm), which when printed with low infill (e.g. 10%) creates a nice air pocket for better insulation, fighting the entropy that wants to ruin your beverage.
The inner diameter is 93 mm (3.6"), so it should fit most cups. If you use larger ones, just scale it up a bit when slicing.
BRB_coffee_coaster_lid.stl | 628.0KB |