DIY Drip Mold

Yea, I know we dont need a mold to make those awesome drips....but at my age, I've learned to work Smarter, Not Harder! Pour your mold, Let it set until its nearly firm, attatch to your tumbler with a rubberband! Once it's cured, just remove your mold! 
  This will fit all the way around a 30 oz. Probably will fit the larger 32 and 40 oz as well. I dont have the larger cups to test. I'm sorry.