Infill is Infill is the internal structure of a 3D printed object, filling the space between the outer walls and the hollow center. It determines how solid or hollow your print feels and performs.. In the context of 3d printing,
it refers to In 3D printing, infill refers to the percentage of material used to fill the interior of a model, controlled through your slicer software and expressed as a percentage (0-100%). This setting directly impacts print time, material usage, weight, and structural strength..
How Infill Works
Your slicer software generates a geometric pattern inside your model based on your infill percentage setting. During printing, the nozzle deposits material in this pattern layer by layer, creating internal support structures. The density and pattern type determine how much material fills the interior space.
Infill Examples
- A decorative miniature figurine printed at 10% infill with a grid pattern uses minimal material, prints quickly in 2-3 hours, and weighs almost nothing while remaining visually solid on the outside.
- A functional mechanical part like a camera mount printed at 20% infill with a honeycomb pattern balances strength and material savings, completing in reasonable time while providing adequate rigidity for real-world use.
- A load-bearing bracket or enclosure for electronics printed at 40-50% infill with a gyroid pattern creates maximum strength-to-weight ratio, taking longer to print but delivering durability needed for structural applications.
Why Infill Matters
Infill settings directly control your print’s strength, weight, cost, and print time. Finding the right infill percentage prevents wasted material on over-engineered prints while ensuring functional parts don’t fail under stress. Most makers discover their sweet spot between 15-25% infill for general printing.
Common Mistakes with Infill
- Using 100% infill for everything wastes material and time; most prints need only 15-20% infill to be perfectly functional while printing 30-40% faster.
- Setting infill too low (5-10%) on structural parts causes layer separation and failure under stress, especially on bridges or load-bearing geometry.
- Ignoring infill pattern types and assuming grid is always best; honeycomb and gyroid patterns provide better strength-to-weight ratios for many applications.
Related Terms
Frequently Asked Questions
What does Infill mean?
Infill is the internal lattice or geometric pattern that fills the hollow interior of your 3D printed object. It’s controlled as a percentage in your slicer software, determining how much material gets deposited inside your model between the outer walls.
Why is Infill important?
Infill is crucial because it balances three competing priorities: print time, material cost, and structural strength. The right infill percentage ensures your print is strong enough for its purpose without wasting hours printing unnecessary solid plastic.
How do I use Infill?
To use infill effectively, start by determining your part’s purpose. Decorative prints work at 10-15%, functional parts need 20-25%, and structural components require 30-50%. Adjust infill percentage in your slicer’s print settings before slicing, then experiment to find what works for your specific use cases.
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