How to Choose the Right 3D Printing Technology: SLA vs SLS vs MJF vs SLM vs FDM
Created on 05.21
Meta Description: Compare SLA, SLS, MJF, SLM and FDM 3D printing technologies by precision, material, cost and batch suitability, select the best additive manufacturing solution. #3d printing technology comparison #SLA vs SLS #MJF vs SLM #FDM 3d printing
Multiple mainstream 3D printing technologies exist for industrial applications, each with unique strengths and limitations based on their working principles (photopolymerization, sintering, melting, extrusion). Many customers waste budget or miss project deadlines by choosing unsuitable printing processes—for example, using SLM for low-cost prototypes (10x cost increase) or FDM for high-precision medical parts (precision not meeting requirements).
We systematically compare five core technologies (SLA, SLS, MJF, SLM, FDM) from precision, material range, surface quality, batch capacity, cost and application scenarios (compliant with ASTM/ISO standards), providing a clear decision-making guide for industrial users.
Core Comparison of 5 Mainstream 3D Printing Technologies (ASTM/ISO Compliant)
1. SLA (Stereolithography) – Precision Appearance Prototypes
• Working Principle: UV laser cures liquid photopolymer resin layer by layer (ASTM D6901 compliant).
• Precision: ±0.02-0.10mm (part size-dependent: ≤100mm ±0.02mm, 100-300mm ±0.05mm, >300mm ±0.10mm).
• Surface Quality: Excellent (raw print Ra ≤0.8μm); no visible layer lines with 0.02-0.05mm layer thickness.
• Materials: UV-curable resin (rigid, high-temp, flexible, medical-grade; ISO 10993 compliant for medical use).
• Batch Capacity: Low-moderate (10-50pcs/batch; single print size up to 400×400×500mm).
• Cost: Low-moderate (printing cost $0.5-$2/cm³; resin cost $3.5-$15/kg).
• Best for: High-precision appearance prototypes, small precision components, low-batch medical mock-ups, dental models.
• Limitation: Not suitable for large-size structural parts (>500mm); resin parts have poor impact resistance compared to nylon/metal.
2. SLS (Selective Laser Sintering) – Medium-Batch Nylon Functional Parts
• Working Principle: Laser sinters powdered materials (nylon, TPU) layer by layer (ASTM F2792 compliant).
• Precision: ±0.10-0.20mm (part size-dependent: ≤100mm ±0.10mm, 100-300mm ±0.15mm, >300mm ±0.20mm).
• Surface Quality: Good matte finish (raw print Ra 1.6-3.2μm); visible layer lines (0.04-0.08mm layer thickness).
• Materials: Nylon (PA12, PA11, PA6), TPU, nylon-carbon fiber composites.
• Batch Capacity: Moderate (50-200pcs/batch; single print size up to 350×350×500mm).
• Cost: Moderate (printing cost $1-$3/cm³; nylon cost $4-$15/kg).
• Best for: Medium-batch functional nylon parts, automotive brackets, flexible components (TPU), industrial wear-resistant parts.
• Limitation: Long single-batch production cycle (8-12h/batch); nylon parts have low heat resistance (<120℃).
3. MJF (Multi-Jet Fusion) – High-Volume Nylon Parts
• Working Principle: Inkjet printer deposits fusing agent on nylon powder, then heats to fuse layers (ASTM F3304 compliant).
• Precision: ±0.10-0.15mm (part size-dependent: ≤100mm ±0.10mm, 100-300mm ±0.12mm, >300mm ±0.15mm).
• Surface Quality: Uniform matte finish (raw print Ra 1.6-2.4μm); more uniform than SLS (density ≥99.5%).
• Materials: PA12 nylon (standard, high-reusability, glass-filled); limited material range compared to SLS.
• Batch Capacity: High (200-1000pcs/batch; single print size up to 380×380×380mm); production cycle 4-8h/batch (faster than SLS).
• Cost: Moderate (printing cost $0.8-$2.5/cm³; PA12 cost $6-$12/kg); lower unit cost than SLS for high-volume batches.
• Best for: High-volume small-medium nylon parts, fast mass customization, automotive/industrial batch components.
• Limitation: Single-material compatibility (mainly PA12); not suitable for large-size parts (>400mm).
4. SLM (Selective Laser Melting) – High-Strength Metal Parts
• Working Principle: High-energy laser melts metal powder layer by layer (ASTM F2924 compliant).
• Precision: ±0.02-0.10mm (part size-dependent: ≤100mm ±0.02mm, 100-300mm ±0.05mm, >300mm ±0.10mm).
• Surface Quality: Rough raw surface (Ra 6.3-12.5μm); requires post-processing (sandblasting, CNC) to achieve Ra ≤1.6μm.
• Materials: Stainless steel (316L, 17-4PH), titanium alloy (Ti-6Al-4V), aluminum alloy (AlSi10Mg), Inconel 718; ISO 1348
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