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Factor
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Metal 3D Printing Technology (SLM/Binder Jetting)
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Metal Injection Molding (MIM)
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Part Complexity
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Shines with highly complex designs—think hollow structures, internal channels, or lattice patterns (e.g., lightweight aerospace brackets). SLM handles 0.1mm fine holes; Binder Jetting works for mid-complexity.
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Best for moderate complexity: Can make threads, grooves, or small features but relies on mold shapes—no closed internal cavities or extreme designs.
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Production Volume
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Ideal for small batches (1–500 parts). SLM is slow for large runs (a 10cm part takes 10–20 hours). Binder Jetting is faster but still lags behind MIM for mass production.
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Excels at large volumes (1,000+ parts). Once the mold is made, parts are produced in minutes, with costs dropping sharply as volume increases.
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Precision & Finish
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– SLM: Tight tolerances (±0.1–0.3%) but slightly rough surfaces (Ra 5–20μm) needing post-polishing.- Binder Jetting: Tolerances (±0.3–0.5%) and rougher finishes (Ra 20–50μm) requiring sintering and machining.
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Tolerances (±0.3–0.5%) similar to SLM, but smoother surfaces (Ra 1–5μm) after sintering—less post-processing needed.
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Materials
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Works with titanium, aluminum, stainless steel, and high-temperature alloys. Powder costs are higher (e.g., titanium powder ~$200/kg).
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Uses stainless steel, iron alloys, and titanium. Powder is finer (5–20μm) and cheaper ($50–150/kg) than 3D printing powders.
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Strength & Durability
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SLM parts are nearly 100% dense (strong as forged metal) but may have slight layer weaknesses. Binder Jetting parts are 95–98% dense, slightly less strong.
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Parts are 95–99% dense, with strength close to forged metal. Uniform powder mixing makes them more consistent in all directions than 3D-printed parts.
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Cost
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High upfront equipment costs (SLM machines: \(100k+; Binder Jetting: \)500k+). No mold fees, but per-part costs drop slowly with volume.
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High mold costs (\(10k–\)50k per mold) but low per-part costs at scale. Materials are efficient (>90% used), so large batches (10k+) become very affordable.
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Part Size
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SLM: Best for small to medium parts (<30cm); large parts risk warping. Binder Jetting can make bigger parts (>50cm) but with lower precision.
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Limited to small parts (<5cm). Large parts are hard to mold and control during sintering.
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