Infill Patterns and Density: Strong, Efficient FDM Prints
The right infill pattern and density can make the difference between a part that breaks and one that lasts years.
What Infill Does
- Structural support for top surfaces
- Mechanical strength for load-bearing
- Weight management — balance strength vs material
Pattern Comparison
| Pattern | Best For | Strength | Speed |
|---|---|---|---|
| Grid | General | ★★★☆☆ | ★★★★★ |
| Gyroid | Impact resistance | ★★★★★ | ★★★☆☆ |
| Cubic | Compression | ★★★★★ | ★★★★☆ |
| Lightning | Display models | ★☆☆☆☆ | ★★★★★ |
| Cross | TPU flexible | ★★★☆☆ | ★★☆☆☆ |
Density by Application
0-5% — Display Models
Lightning or grid. Uses ~80% less material than solid.
10-15% — General Purpose (Sweet Spot)
Gyroid or cubic. Default for PLA+ and PETG. ANTINSKY PLA+ at 15% gyroid = strong and lightweight.
20-30% — Functional Parts
For brackets and tools. Cubic at 25% with 4 walls. ANTINSKY PETG recommended.
40-60% — Mechanical Parts
5+ walls with cubic infill. Wall count matters more than density at this range.
Filament-Specific Guide
| Filament | Pattern | Density |
|---|---|---|
| PLA+ | Gyroid | 10-25% |
| PETG | Cubic | 15-30% |
| ABS | Tri-Hexagon | 20-40% |
| TPU 85A | Cross/Gyroid | 5-15% |
Advanced Tips
- Modifiers: Different density per region in same print
- Adaptive infill: OrcaSlicer/PrusaSlicer auto-reduces in low-stress areas
- Walls matter more: 4-5 perimeters > high density for strength
- Top/bottom: 5+ solid layers for smooth finish
Common Mistakes
- 100% for everything — wasteful; 25-40% + thick walls is equivalent
- Grid only — Z-axis binding, use gyroid
- TPU with grid — collapses; use gyroid or cross
Visit InnoStation 3D for ANTINSKY filaments — PLA+, PETG, ABS, TPU.
— Inno Uncle