What exactly is infill? The material’s structure within a 3D printed component is known as infill. 3D printed objects, like the underside of a bridge, feature an infill that manipulates the part’s physical attributes, such as strength, structure, and weight.

Infill is one of the most important parameters in 3D printing; however, I was curious how much infill you truly need while printing. So, I did some studies to determine excellent infill percentages, which I’ll discuss in this post.

3D Printed Parts Infill Percentage

Use the following suggestions to determine the optimal infill percentage for your project:

  • 0-20%: Non-functional parts:

10-20% infill is suitable for sections that are not functional or do not need to bear force, such as a display model or presentation prototypes. No infill may be a reasonable alternative in certain circumstances if there are no huge flat surfaces on the top of the print. If the print has huge flat surfaces on the top, some infill is required to support those surfaces.

  • 20-40%: Light-use components:

A reasonable amount of infill gives roughly the same strength as a solid part at a lower cost for functional sections that will be subjected to some stress.

  • 40-100% Heavy-duty components:

A greater infill percentage is the ideal option if your parts must endure substantial forces or if strength is the most critical aspect above cost. However, increasing the infill proportion over 60% decreases strength.

Advantages of 3D Printing with Infill

Infill 3D Printing Benefits Increases Printing Speed Because infill is a repeating three-dimensional pattern, it is simple to print. The 3D printer prints in layers, with each layer consisting of two major components: infill and outline. The outline is the layer’s perimeter that creates the print model’s exterior shell or walls.

When printing a layer, the outline requires a high level of accuracy since it specifies the contour of the item. Meanwhile, since the infill is a repeating pattern, it may be printed with less accuracy than previously. This implies that it can be produced swiftly in a back-and-forth motion.

  • Low Material Requirement

The material utilized will be the highest when a model is produced as a pure solid interior. This is referred to as an infill with 100% infill density. We may use a proper infill to minimize the material used while manufacturing a 3D model. We may choose the infill density based on our requirements.

  • Density of infill

The quantity of material utilized for infill is defined as the infill density. The greater the density of the infill, the fuller, heavier, and (in principle) stronger the portion. Density influences buoyancy and material consumption in addition to weight and strength.

Infill density is expressed as a percentage, with 0% being hollow and 100% solid. The majority of designers stick to 5% jumps. Standard prints have an infill of 15-50%, while useful prints (such as engineering components) have an infill of 50-100%.

Figurines have up to 15% less infill. The infill provides stiffness for flexible sections, with flexibility defined by the material. The quantity of infill required is determined by the kind of item being created.

  • Pattern of infill

The infill pattern is the infill’s structure. These vary from simple lines to complex honeycombs and lattices. Different infill patterns provide unique properties such as increased strength, stiffness, flexibility, buoyancy, and weight load.

Here are the most frequent infill patterns:


Printed in one direction for two-dimensional strength.


Honeycomb density gives moderate strength.


With weight growth, grids quadruple the strength and rigidity of lines.


Two-dimensional strength in the XY plane.


Stacked cubes inclined at 45 degrees for three-dimensional strength.


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