The Translation: Infill is the internal structure of a 3D printed object. Instead of printing a solid block of plastic (which wastes material and takes forever), printers create a hollow shell filled with a honeycomb or grid pattern inside.
Use It In a Sentence: “I printed this shelf bracket with 40% infill so it would be strong enough to hold my heavy books.”
Why You Care: You are in control of the infill percentage. You rarely need an object to be 100% solid. For a decorative statue on your desk, 10% infill is plenty. For a mechanical part that needs to hold weight, you might bump it up to 30% or 40%. It saves you massive amounts of time and plastic.
Hobby Lingo 