Resin or FDM? Make an informed decision.

The Differences and Similarities Between Resin 3D Printing and FDM 3D Printing

Introduction

3D printing has revolutionized the manufacturing and prototyping landscape, offering a variety of methods to turn digital designs into physical objects. Two of the most popular 3D printing technologies are Resin 3D printing and FDM (Fused Deposition Modeling) 3D printing. While both can create intricate designs, they differ significantly in processes, materials, and applications. Let’s explore how these two technologies compare.

FDM 3D Printing

Process: FDM technology works by extruding thermoplastic filament through a heated nozzle, layer by layer, to build an object from the bottom up. The filament is melted and deposited in a pre-defined path, hardening almost instantly as it cools.

Materials: Common materials used in FDM printing include PL, ABS, PETG, and TPU. These are typically plastic-based and come in a variety of colors and properties, like flexibility or strength.

Applications: FDM printing is widely used for creating prototypes, functional parts, and everyday objects. It’s valued for its cost-effectiveness, ease of use, and ability to produce large objects relatively quickly.

Resin 3D Printing

Process: Resin 3D printing, also known as SLA (Stereolithography) or DLP (Digital Light Processing), uses a liquid photopolymer resin that is cured layer by layer using a UV light source. The printer builds the object upside-down, slowly lifting it out of the resin vat as each layer is cured.

Materials: The materials used in resin printing are liquid photopolymer resins, which can vary widely in properties, including flexibility, durability, and color. They are typically more expensive than FDM materials but offer superior detail and surface finish.

Applications: Resin printing is best used for high-detail models, such as miniatures, dental models, jewelry, and highly detailed prototypes. The precision and surface finish are generally better than what can be achieved with FDM.

Key Differences

1. Detail and Precision:

   • FDM: While capable of good detail, FDM printers generally cannot match the precision and smooth finish of resin printers.

   • Resin: This method excels at producing finely detailed and intricate parts with a smooth surface finish.

2. Strength and Durability:

   • FDM: The layers in FDM prints are mechanically bonded, which can create weak points but overall produces strong parts suitable for functional use.

   • Resin: Resin prints can be brittle, though some resins are designed for high strength. They are generally less durable than FDM prints.

3. Printing Speed:

   • FDM: Typically faster for larger objects but slower for high-detail work.

   • Resin: Can be slower in terms of build time, but excels in producing high-detail parts efficiently.

4. Cost:

   • FDM: Generally more cost-effective, both in terms of printer cost and material expense.

   • Resin: Typically more expensive due to the cost of resins and the post-processing required.

How They Are Alike

1. Additive Manufacturing: Both technologies build objects layer by layer, which is the core principle of additive manufacturing.

2. Versatility: Both can produce a wide range of objects, from simple prototypes to complex models.

3. Accessibility: Desktop models of both FDM and resin printers are available, making both technologies accessible to hobbyists and professionals alike.

Conclusion

FDM and Resin 3D printing each have their unique strengths and applications. FDM is prized for its cost-effectiveness, material strength, and speed, making it suitable for functional and larger parts. Resin printing, on the other hand, is unbeatable in terms of detail and surface finish, best for intricate designs and high-detail models. By understanding these differences and similarities, you can choose the right technology for your specific needs.

Now that you know, get out and make the world what you want it to be!

Nathaniel Dayton

Founder: DaytonAdditiveManufacuturing LLC.