As the earliest 3D printing technology, photocured (resin) printing remains a professional favorite. Although FDM (Fused Deposition Modeling) enjoys higher sales today, light curing offers distinct advantages. In this guide, I will compare these two technologies to help you choose the right process for your project.

Printing Principles: Top-Down vs. Extrusion

Light curing 3D printing operates differently than FDM. It uses a top-down method, relying primarily on lasers or digital projectors to cure liquid resin. Currently, the market favors DLP and LCD technologies for desktop-level professional teaching. Conversely, industrial-grade SLA equipment uses lasers for larger builds. While industrial SLA covers bigger areas, DLP and LCD typically offer superior localized accuracy.

Superior Printing Speed and Batch Efficiency

Light curing offers significantly faster speeds than FDM. This efficiency shows when printing multiple objects simultaneously. In resin printing, the time remains the same regardless of the number of pieces on the platform. FDM cannot match this performance because it must extrude material for each part individually. Therefore, light curing is much better for small-batch production.

Extreme Precision and Surface Quality

Precision is where light curing truly shines. Standard FDM printers usually achieve an accuracy of about 0.1mm. In contrast, light curing easily reaches 0.01mm. I always advise users who require smooth surfaces and fine details to choose resin-based printers. This level of detail is essential for dental, jewelry, and complex assembly parts.

Maintenance and Post-Processing Considerations

However, light curing has specific maintenance requirements. Operators must frequently replace consumable parts like exposure screens and release films. Additionally, using photosensitive resins requires extensive post-processing. You must wash and cure the objects after the initial print. While FDM is better for low-precision industrial prototypes, resin printing remains the king of high-detail applications.

Barry Zeng
Senior Manufacturing Engineer, Shanghai Yunyan Prototype & Mould Manufacture Factory
Expert in SLA, DLP, and FDM 3D printing technologies.