This is the caffeine molecule, you can use it as a coffee mug placemat
thingiverse
Caffeine's Molecular Design Enables a Coffee Mug to Rest Upon It. Inspiration strikes from the depths of thingiverse; taking that spark, I crafted an original version - actually, number six now. Leveraging Sketchup's power, the 3D model was carefully created and converted into stl format for flawless print preparation. With the PP3DP up printer software at the helm, the precise stl file was brought to life. Previous iterations didn't explicitly highlight each atom with a letter, this iteration breaks that trend; omitting hydrogen only because, in chemistry parlance, it's not always necessary to label it.
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