Best Infill Settings for PLA: Strength vs Speed

Infill is the internal structure of your 3D print—and it's where most makers waste the most time and plastic. Get it right, and you save hours without sacrificing strength.

Start with infill percentage

• 0–10%: Display models, figurines, decorative pieces. Fast, light, low material use.
• 15–20%: Standard functional parts, desk organizers, prototypes. The sweet spot for most prints.
• 30–50%: Parts under load, brackets, mounts. Stronger, but significantly more print time and plastic.
• 100%: Maximum strength, but rarely needed—20% infill with 4 perimeters is often stronger and faster.

Choose the right pattern

• Grid / Lines: Fastest, easiest to slice. Good for low-infill display prints.
• Gyroid: Best strength-to-weight ratio. Slightly slower to slice, but uses less plastic for the same strength. Our top recommendation for functional PLA parts.
• Cubic / Octet: Excellent isotropic strength (equal in all directions). Great for parts that take stress from multiple angles.

Match infill to your print speed At Arkforge PLA's speed range of 50–200 mm/s, infill can print faster than perimeters. Set infill speed 20–30% higher than wall speed—just make sure your printer can keep up without skipping steps.

Rule of thumb: More perimeters beat more infill for strength. A part with 4 walls and 15% infill is often stronger than 2 walls and 30% infill—and prints faster.

Don't default to 20% grid for everything. Pick infill based on what the part actually needs.

Arkforge PLA's consistent flow makes every infill pattern predictable—no weak spots from under-extrusion.

Explore our PLA filament collection.

Happy printing!

– Arkforge Team