What Are 3D Printers?

3D printers are machines that build objects layer by layer from digital designs. Different printing technologies use different materials, processes and post-processing methods, so the term covers a wide range of equipment.

Main 3D-printing processes

Desktop filament printers, commonly using fused filament fabrication or related extrusion methods, melt and deposit material in layers. Resin printers use vat-based photopolymer processes to cure liquid resin, while powder-bed processes use powdered materials and are generally associated with more specialised equipment. The technology affects print detail, materials, speed, finishing and safety requirements.

Materials and workflow

Filament choices include different thermoplastics with different temperature and mechanical characteristics. Resin systems require controlled handling and post-processing. The printer, material, slicer settings, build surface and intended use all interact. Store materials according to supplier instructions and keep safety data available where applicable.

Safety and suitability

3D printing can involve hot components, moving mechanisms, electricity, emissions and, depending on the technology, chemicals, lasers or powders. University of Edinburgh guidance recommends risk controls such as suitable equipment, ventilation^★ and enclosure where appropriate. Choose a printer for the intended workload and material rather than assuming all desktop machines are equivalent.