This old-school idea on how to repurpose 3D viewers shows us how much—and how little—the technology has changed.

How to use the DIY viewer: The finished box should be held with the pin-hole side facing the sun. It may take a little practice pointing the box.

In a video by [Slant 3D] a number of tips and tricks to improve parts design with tolerance in mind are provided.

The best 3D printers make it easy for beginners and experts to print anything they can imagine. They are top-rated products with large user communities making online resources on sites like Reddit ...