What is Infill 3D Printing?

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Updated January 13, 2023

If you are new to the world of physical printing, you may wonder what is infill 3D printing. Some of the best printers, after all, are 3D printers; these models use various methods to get the job done. So what is infill printing, and how does this method help the best 3D printers create gorgeous physical objects? Keep reading to find out.


  • Infill 3D printing refers to the interior of a printed physical object, as some objects are hollow and others are not.
  • Choosing a high infill density and higher infill percentages slow down the print time and use more filament to create the internal structure.
  • However, using the strongest infill pattern also increases the stability and durability of the finished printed object, despite the uptick in printing time.

What is Infill on a 3D Printer?

If you are wondering how fast 3D printers are, you will likely learn all about infill. When dealing with 3D printers, finished prints break down into two major components, which is true even if you are looking for the best 3D printers for cosplay. There is the exterior and the interior if you are looking for 3D printer bridging tips. The exterior is obvious. This is the part everyone sees. However, the interior is variable and is known as the infill.

Insider Tip

3D printers typically allow users to choose from more than a dozen infill designs and patterns.

The infill level dictates just how hollow, or solid your object is, and this metric impairs when learning how to 3D print faster. Quite obviously, the more solid the interior of an object is, the longer it takes to print.

Benefits of Solid Infill Designs

There are a number of benefits to choosing a solid infill design when making a print, even if doing so forces the print to take longer to complete and uses up more of your materials.


Stability is key if you are making something to serve a purpose, such as a tool, or even a figure that will stand on a shelf somewhere. Hollow objects print quicker and use less filament but may struggle to stand on their own and certainly lack stability compared to thicker cousins. Many printers offer a number of infill patterns here to allow users to choose from various thicknesses.

Unique Prints

Sometimes blueprints call for unique designs that find the infill jutting slightly out to create a gorgeous aesthetic effect. This process can be mimicked on the exterior, but it truly shines when using infill.

STAT: The walls, however thick, form the outermost regions of the part, while the infill is whatever exists within them. (source)


Right up there with stability, using a decent infill pattern on your print helps the finished object last longer, as it will be more durable. Generally speaking, the thicker the infill design or pattern, the more durable the finished product will be.

Infill 3D Printer FAQs

What percentage should I use?

The percentage of infill in your 3D model depends on material usage, desired tensile strength, the types of infill patterns available, and more.

What pattern should I choose?

You can choose from any of the available infill patterns, from triangular infill to straight lines and standard infill lines. Experiment to find the correct balance between using a certain percentage of infill, material usage, and tensile strength.

What is the purpose of infill in 3D printing?

The purpose of infill is to allow objects to be denser, sturdier, and more durable, even if it increases material consumption and print time but lowers print speed.
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