Can you 3d print a balloon?
Could the 3d printed balloon be able to stretch like a good balloon would?
Would it be able to float/slow down the fall of something as heavy as an egg?
Would it be able to hold a substance in it, such as helium and water, without the substance falling out of the balloon or breaking it?
3D printing has its Limitation when it Comes to material and Minimum printable thickness.
As far my knowledge goes, I do not know any 3D printable material that can be inflated like baloon. There are some rubbery type 3D printable material and recently you can print with Silicone. But None of them are inflatable.