Complete 3D Printing Materials Guide 2025
A Technical Handbook from JLYPT’s Materials Lab
Introduction Selecting the correct additive-manufacturing (AM) material is the single highest-leverage decision in the product-development cycle. It dictates mechanical reliability, regulatory compliance, aesthetic finish, and ultimately, cost per part. JLYPT’s ISO 9001-accredited materials laboratory has characterized more than 50 industrial-grade polymers across FDM, SLA, SLS, MJF, and SLM platforms. This handbook delivers the data sheets, process-parameter windows, and three fresh case studies that engineers need to make evidence-based choices, without marketing fluff.
Table 1 , Material Quick-Selector Matrix
Use-Case FDM SLA SLS MJF SLM High-temp (>150 °C) PEI / PPSU , PA12 CF PA12 CF AlSi10Mg Food contact PETG-FDA Bio-Med Clear PP Natural , 316L ESD safe PETG-ESD ESD-SLA PA12 ESD PA12 ESD Ti64-ESD Transparent optics , Clear / ABS-Like , , , Flame retardant UL94 V-0 PC-FR Flame-Retardant PA11 FR , , Flexible seals TPU Flexible resin TPA TPU ,
Table 2 , Mechanical & Thermal Property Datasheet (23 °C)
Material Process Tensile (MPa) Elongation (%) HDT 0.45 MPa (°C) Impact (kJ/m²) Cost / cm³ PLA Pro FDM 55 6 55 16 $0.04 ABS FDM 38 25 95 38 $0.05 Nylon 12 CF FDM 110 8 170 55 $0.12 PETG Clear FDM 50 120 75 35 $0.06 PC-FR FDM 70 110 135 60 $0.11 PEI 9085 FDM 110 6 190 50 $0.28 Tough 2000 SLA 55 35 55 30 $0.18 Clear GP SLA 65 12 52 20 $0.16 Bio-Med Clear SLA 55 20 50 25 $0.22 PA12 SLS SLS 48 18 95 32 $0.09 PA12 CF MJF MJF 70 10 170 45 $0.13 AlSi10Mg SLM 340 8 500 90 $0.45
Section 1 , FDM Thermoplastics Deep-Dive
1.1 Rheology & Printability • PETG exhibits shear-thinning above γ̇ = 100 s⁻¹; maintain volumetric flow Q ≥ 4 mm³/s to avoid shark-skin. • PEI requires nozzle ≥ 300 °C and chamber ≥ 80 °C to prevent layer delamination (ΔT > Tg − 20 °C).
1.2 Moisture Management • Nylon 12 absorbs 0.4 wt % in 24 h @ 50 % RH → dry at 80 °C for 4 h before printing. • PC-FR: 0.2 wt % moisture causes surface blistering; use sealed dry-box with < 10 % RH.
1.3 Annealing Protocol • PEI: 180 °C for 2 h in nitrogen increases HDT by 10 °C and tensile by 8 %. • Post-anneal shrinkage: +0.2 % in-plane, +0.3 % Z, compensate in CAD.
Section 2 , SLA Resins: Chemistry & Curing
2.1 Monomer Families • Methacrylate: high stiffness, brittle (Tough 2000). • Epoxy-acrylate: excellent clarity, low shrink (< 0.5 %).
2.2 Biocompatibility • ISO 10993-5 cytotoxicity pass required for surgical guides. • Gamma sterilization stability: Clear GP retains 95 % tensile after 25 kGy.
2.3 Post-Cure Optimization • 405 nm LED array, 60 °C, nitrogen purge for 15 min → 95 % double-bond conversion. • Over-cure (> 30 min) increases brittleness (ΔIzod −15 %).
Section 3 , SLS & MJF Polyamide Powders
3.1 Particle Size Distribution • D50 = 60 µm for PA12 SLS; D50 = 50 µm for MJF → smoother sidewalls Ra 4 µm vs 6 µm.
3.2 Refresh Ratio • PA12 SLS: 50 % virgin / 50 % recycled maintains mechanical properties within ±5 %. • MJF refresh 30 % due to thermal cycling degradation.
3.3 Vapor Smoothing • Ethyl acetate vapor 30 s reduces Ra from 6 µm to 1 µm, sealing surface porosity.
Section 4 , Metals: SLM vs. Binder Jet
Property AlSi10Mg SLM 17-4 PH SLM 316L BJ Unit Tensile 340 1100 520 MPa Elongation 8 6 30 % Surface Ra as-built 9 11 15 µm Heat treatment T6 H900 Sinter + HIP , Cost / cm³ 0.45 1.10 0.35 USD
Section 5 , Cost Analysis Example
Scenario: 500 pcs, 50 cm³ each, mid-temperature enclosure.
表格 复制 Material Process Tooling ($) Part Cost ($) Lead (days) TCO ($) PEI 9085 FDM 0 14.0 4 7,000 PA12 CF SLS 0 6.5 6 3,250 ABS Injection 8,000 1.2 28 8,600 Decision: SLS PA12 CF wins on total cost of ownership (TCO).
Section 6 , Case Studies
Case 1 , High-Temp Battery Housing Client: E-motorcycle OEM Challenge: 120 °C service, UL94 V-0, 300-piece pilot. Solution: PEI 9085 FDM, 0.2 mm layer, CNC milled gasket groove post-print. Result: Passed thermal cycle 1,000 x −40 ↔ 120 °C; saved $45 k tooling.
Case 2 , Surgical Drill Guide Client: Med-tech start-up Challenge: Biocompatible, sterilizable, 50 mm long, 0.1 mm accuracy. Solution: Bio-Med Clear SLA, 25 µm layer, autoclave validated. Lead time: 3 days vs. 5-week machined PEEK.
Case 3 , Optical Lens Prototype Client: AR headset OEM Challenge: 50 mm diameter, λ/4 surface, 48-hour turnaround. Solution: Clear GP SLA, 0.05 mm layer, vapor-polished, then UV-coated. Wavefront error: 110 nm RMS vs. 60 nm target, acceptable for prototype.
Section 7 , Sustainability & Recycling
• PETG & PLA: mechanical regrind → desk organizers. • PA12 SLS: closed-loop powder refresh 50 % reduces virgin resin by 40 %. • Metal powder: argon inerting + sieving enables 95 % reuse after SLM.
Section 8 , FAQ
Q: Which material for outdoor UV exposure? A: ASA or PC-UV; add 2 % HALS masterbatch for > 5 years colorfastness.
Q: Can FDM Nylon be tapped? A: Yes, print undersized 0.15 mm, chase with tap; use heat-set inserts for > M6.
Q: SLA vs MJF dimensional accuracy? A: SLA ±0.1 mm up to 100 mm; MJF ±0.2 mm but isotropic strength.
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