Upcycle your old lightbulbs into this teapot that is cool. With a strainer this can be used for tea bags and tea leaves! If you've got heat resistant filament subsequently brew yourself a hot cuppa, otherwise I'd recommend making iced tea just (the second greatest thing after a cold pint on a warm summers day!) To prevent the likely dangerous effects of plastic that is melted in your tea
This also seems cool as a cosmetic thing, showing off both your upcycled lightbulbs and your 3D printing abilities. This layout fits all regular screw top lightbulbs, designed to be support free may need supports that are minimal depending on your own machine/ degree that is bravery!
Follow my profile of upcycling your old material for more wonderful manners.
I have created a step by step infographic on the best way to hollow out your lightbulbs, an amzingly straightforward (and fun) process!