FDM or Resin? Guide to Choosing the Right Technology

FDM or Resin? Guide to Choosing the Right Technology The first decision in 3D printing is technology selection. The same model, when produced with FDM, is durable and economical; when produced with resin, it can be smooth but brittle. Choosing the right technology for your project prevents later corrections. FDM (Filament Production) When Is the Right Choice? FDM works by layering melted filament. - Large volume parts: For measurements of 250 × 250 × 250 mm and above, FDM is almost the only option. - Functional and load-bearing parts: Provides high durability with engineering materials such as PETG, ABS, ASA, PA, and PC. - Prototyping and assembly trials: It is the most efficient method when fast and low-cost repetitions are needed. - Economical production: In large-scale production of the same part, the cost per part drops significantly. The limitation of FDM is the visibility of layer lines and limited resolution in fine details. Resin (SLA/DLP/LCD) When Is the Right Choice? Resin printing works by layer-by-layer solidification of liquid resin cured with UV light. - High detail: Superior for parts requiring fine craftsmanship such as miniatures, jewelry, dental models, and figures. - Smooth surface: Layer lines are nearly invisible, offering an ideal surface for painting and presentation. - Thin walls and watertightness: Successful in thin-walled geometries. Limitations of resin: The cost per part is higher; washing and UV curing steps require extra labor; standard resins are more brittle against impact and can yellow over time with UV. Three Questions to Ask When Deciding 1. Will the part bear load or be visual? If it bears load, choose FDM; if visual detail is priority, choose resin. 2. How large is the size? For parts over 200 mm, FDM's cost and applicability are clearly advantageous. 3. How many units will be produced? For a single detailed part, resin is more economical; for dozens of functional parts, FDM is more economical. Hybrid Approach In some projects, the best solution is to use both together: the body and mechanical parts are made with FDM, while fine-detail covers or decorative surfaces are made with resin. This way, both durability and aesthetics are achieved. When requesting a quote from PrintFlow TR, you can specify your material and technology preferences and view the cost items transparently. This way, you can compare which technology suits your budget and project with data.