Technology
How does a 3D printer work?
A 3D printer builds objects layer by layer from a digital design. Most melt plastic filament and lay it down in thin layers that cool and fuse, gradually stacking up into a solid 3D shape.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how a 3D printer works.
Step by step
- 1It starts from a 3D digital model sliced into thin layers.
- 2The printer deposits material (often melted plastic) one layer at a time.
- 3Each layer fuses to the one below, building the object upward.
- 4Other methods cure liquid resin with light, or fuse powder.
Frequently asked questions
- How does 3D printing build an object?
- It adds material layer by layer following a sliced digital model, fusing each layer to build up the shape.
- What materials can 3D printers use?
- Commonly plastics, but also resins, metals, and even concrete or food, depending on the printer.
- What is 3D printing used for?
- Prototypes, custom parts, medical devices, and small-scale manufacturing.