What is 3D Printing?

Assumed audience

• Reading level: general adult.
• Background: no engineering required.
• Goal: understand the basic idea and why it matters.

Core idea

3D printing makes physical objects by adding material layer by layer from a digital design.

Common kinds

• FDM (Fused Deposition Modeling): melted plastic is laid down in layers.
• Resin printing: liquid resin is hardened by light in thin layers.

Why people use it

• Rapid prototyping.
• Custom parts or tools.
• Small-batch manufacturing.

Limits to know

• Prints have layer lines and weaker direction across layers.
• Print quality depends on setup and material choice.