SLA 3D Printing Accelerates Development and Manufacturing in the Automotive Industry

Traditionally, after the concept and design phase, automotive manufacturers produce scale models, typically 1:5, for evaluation of different proposals. After selecting the best options, they advance to full-size models, 1:1, which are subjected to aesthetic analysis, aerodynamic testing and successive design modifications. In the traditional method, a complete clay model can take about three months to be produced manually. Even with 5-axis CNC milling, manufacturing an automotive model can require at least one month. In the engineering phase, each new vehicle involves coordination of thousands of components. Kings 3D notes that a new automobile can integrate more than 20,000 parts, many of which are not yet in mold production phase during initial development stages. In these phases, test parts and assembly products are frequently produced by CNC or sheet metal. However, complex geometries, curved surfaces and components with multiple machining zones can make the process more expensive, time-consuming or technically limited.

Large-format SLA 3D printing allows significant shortening of the development process, enabling production of 1:1 models in just a few days from digital data. According to Kings 3D, this approach can reduce process time by at least five times and decrease costs by about half. The presented solution combines high-precision SLA 3D printing with vacuum casting. The process begins with 3D printing of the prototype, continues with production of a silicone mold under vacuum and ends with casting of materials such as PU in low-pressure environment. The result is parts with performance comparable to injection-molded components, capable of replacing applications in ABS, PC, rubber and other technical materials. Elements such as front grilles, curved structures, interior and exterior components or design details with high geometric complexity can be difficult to produce by conventional methods. 3D printing allows manufacturing these areas quickly and precisely, subsequently integrating them into the vehicle model for aesthetic, dimensional or functional validation. SLA technology can also support production of prototypes for casting molds. In the case of automotive components such as panels, covers or engine blocks, precision requirements can reach values in the order of 10 to 20 microns. Kings 3D highlights the use of the large-format SLA printer Kings1700, equipped with multi-laser system, for production of prototypes intended for sand molds, simplifying processes and reducing costs in casting.

This capability is particularly relevant for design, engineering and prototyping teams that need to test multiple iterations in a short time, maintaining surface quality, geometric detail and dimensional control. In the prototype testing phase, manufacturers evaluate performance, reliability, strength and durability. Tests such as wind tunnel testing, road testing, field testing and crash tests are part of the automotive validation process. For parts requiring high structural strength, CNC continues to have application. However, for many interior and exterior components, the combination of SLA 3D printing with vacuum casting offers a fast and economical alternative for validation before final production. SLA 3D printing can also be applied in after-sales maintenance, especially in customized, sports, modified or low-production vehicles. In these cases, ordering small quantities of replacement parts from the original manufacturer or producing dedicated molds can be expensive. Production by 3D printing allows obtaining specific components in a more economical and flexible way.

Large-format SLA 3D printing reduces automotive model development time by at least five times compared to traditional methods, decreasing costs by about half. It allows greater flexibility in the engineering phase, producing test parts with complex geometries quickly and precisely. The combination with vacuum casting generates components with performance comparable to injection-molded parts. It offers precision in the order of 10 to 20 microns for casting mold applications. It provides economical solutions for maintenance and replacement parts in low-production vehicles.

At NM3D Ibérica, we support industrial companies in evaluating and implementing additive manufacturing solutions, rapid prototyping, dimensional control and reverse engineering, helping to accelerate product development and reduce costs in validation processes. Industrial 3D printing is not just a prototyping tool. It is a strategic technology for companies seeking greater agility, greater design freedom and faster response to automotive market demands.