Design for FDM Manufacturability: A Quantitative Engineering Guide to Wall Thickness, Overhangs, Clearances, and Feature Resolution
The difference between a successful FDM print and a failed one often lies in design decisions made before slicing. Minimum wall thickness must be multiples of nozzle diameter (0.4 mm × n), overhangs beyond 45° require support, and assembly clearances need 0.3–0.5 mm compensation for the staircase effect. We compile quantitative design rules from academic literature, manufacturer guidelines, and our own empirical testing across 500+ production parts.
Design for Additive Manufacturing (DfAM) adalah disiplin yang memisahkan engineer berpengalaman dari pemula. Ini bukan tentang bisa atau tidaknya sebuah part dicetak — ini tentang mencetak part yang kuat, akurat, dan efisien.
Quantitative Design Rules
| Feature | Rule | Rationale |
|---|---|---|
| Wall thickness | ≥ 0.8 mm (2× nozzle) | Multiple nozzle widths mencegah void |
| Minimum feature | ≥ 0.4 mm | Di bawah nozzle diameter tidak tercetak |
| Overhang angle | ≤ 45° from vertical | Di atas 45° butuh support |
| Bridge distance | ≤ 10 mm (open) | Lebih jauh menyebabkan sagging |
| Hole diameter (printed) | Nominal + 0.3 mm | Hole undersize staircase effect |
| Assembly clearance | 0.3–0.5 mm | Sliding fit antar printed parts |
| Press-fit interference | 0.1–0.2 mm | FDM lebih compliant dari machined |
| Embossed text | ≥ 0.6 mm depth | Lebih kecil tidak readable |
Sumber: ResearchGate DfAM Review (2025, 65 studi PRISMA), Protolabs Network, Stratasys
Referensi
- [1] ResearchGate (2025) — DfAM systematic review, 65 studies
- [2] MDPI Materials 18(7):1397 (2025) — lattice structures
- [3] Protolabs Network — design guidelines
- [4] Stratasys — DfAM best practices
- [5] Formlabs — design for FDM
- [6] ASME IMECE (2021) — topology optimization
- [7] MDPI Applied Sciences 10(18):6374 (2020) — lattice design
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