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Intro
If prints crack or delaminate, your settings are biased toward looks rather than strength. With a few design and slicer tweaks, you can produce parts that handle real stress.
Choose the right material
- PLA — stiff and crisp but brittle
- PETG — tough and slightly flexible
- ABS/ASA — strong, heat- and UV-resistant
- Nylon — very tough and wear-resistant
- Fiber-filled — stiffer; requires hardened nozzle
Increase wall count
Strength comes from perimeters more than infill. Use 3–4 walls instead of 2, with wall thickness ~1.2–1.6 mm for functional parts.
Use higher infill strategically
15–20% is fine for décor; go 40–60% for brackets or mounts. 100% is rarely necessary and adds weight/time.
Orient for layer strength
Rotate parts so forces pull along layers, not between them. Add fillets to reduce stress concentrations.
Improve layer adhesion
- Print hotter within safe range
- Reduce cooling fan
- Slow slightly for better fusion
- Keep filament dry
Other boosters
- Wider extrusion width (110–120%)
- Larger nozzles (0.6–0.8 mm)
- Anneal PLA at 60–70 °C for extra strength
FAQ
Is 100% infill always strongest? Not necessarily—walls matter more.
Which setting matters most? Perimeter count, then orientation, then infill.
Wrap-up
Design for force direction, add walls, and pick the right material. A few tweaks transform fragile prints into durable components.
Thanks for reading! If you have any questions then please drop me a message using the contact form below
Dylan
