These 3D sphere arrangements are intuitive. It's how tennis balls or oranges are often stacked in stores. They waste the least amount of space between balls, filling about 74% of total space.

“I can’t see in 3-D, much less 4-D,” says Segerman. For the past couple of decades, mathematicians have increasingly relied on digital imaging to see complex shapes.

[DaveMakesStuff] demonstrates a great technique for 3D printing a sphere; a troublesome shape for filament-based printers to handle. As a bonus, it uses a minimum of filament. His ideas can be appl… ...

Alright, everyone has 30 seconds to get all the jokes out of their system before we proceed with a look at this 3D printed wooden ball polisher. Ready? Theoretically, making a sphere out of any mat… ...