Keep It Warm!
thingiverse
I'm glad you found it easier to just put a lid on your cup, but let's be real, why make things so straightforward? One day when I was feeling completely unentertained, I decided to create this utterly pointless 'thing'.
Download Model from thingiverse
With this file you will be able to print Keep It Warm! 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 Keep It Warm!.