The Origins of 3D Printing

3D printing, also known as additive manufacturing, began in the early 1980s as a solution to a simple but costly problem: prototyping parts took too long and required expensive molds. In 1983, Chuck Hull invented stereolithography (SLA), the first commercially viable 3D printing process, using ultraviolet light to cure liquid resin layer by layer. This breakthrough became the foundation of modern additive manufacturing and led to the creation of 3D Systems, the first major 3D printing company.

Although Hull is widely credited as the father of 3D printing, the idea of building objects layer by layer was emerging elsewhere. In 1981, Hideo Kodama described a similar rapid‑prototyping method using photopolymer resin, but his patent was never completed.

By the 1990s, new technologies expanded the field:

• Fused Deposition Modeling (FDM), patented by Scott Crump in 1989, introduced thermoplastic extrusion.
• Selective Laser Sintering (SLS), developed by Carl Deckard, enabled printing with powdered materials.
  These innovations pushed 3D printing beyond prototyping and into industrial applications across aerospace, automotive, and medical sectors.

The 2000s and 2010s marked the democratization of 3D printing. As key patents expired, affordable hobbyist printers like RepRap and MakerBot emerged, making the technology accessible to small businesses, educators, and home users.