• Post category:3D Printing

When it comes to 3D printing, there is an essential factor that you should take into your consideration infill percentage vs strength. Knowing the right combination of these two factors can make a huge difference in the performance of printed parts. It can determine how successful projects turn out and impact their overall performance and also includes visual appearance. Understanding this relationship between infill percentage vs strength is key to maximizing the performance of 3D-printed parts.

Infill Percentage VS Strength Choose Infill Percentage for 3D Printed Part

What Is Infill in FDM 3D Printing Process?

Infill is a crucial aspect of FDM 3D printing. It refers to the internal structure that fills up the empty space between the walls of a printed object. In other words, it is what gives a 3D model its strength and durability. The different infill percentage determines how much material will be used for this purpose. It can vary depending on the specific requirements of each project.

There is a delicate balance between infill percentage and strength in FDM 3D printing. A higher infill percentage usually means stronger prints because more material is used to fill up the interior space. This also translates into longer print times and increased material costs. On the other hand, reducing the infill percentage can lead to faster print times and lower costs but may compromise on strength.

Suggested Geometry You May Choose for Infill FDM 3D Printing?

When it comes to FDM 3D printing, the infill pattern you choose can significantly affect the strength and quality of your print. Infill percentage is an essential factor to consider while choosing a pattern for infill since it affects both the time and cost of printing. Higher infill percentages result in stronger prints but also take longer to print and consume more material.


A rectangular infill pattern involves creating a grid-like structure inside the object with straight lines running along both axes. This creates a strong, stable structure that can withstand stress and pressure from all directions. The solid lines also provide more surface area for adhesion between layers, which helps prevent delamination and ensures an overall stronger print.


Diagonal infill patterns have become increasingly popular in recent years due to their superior strength-to-weight ratio. Diagonal infill patterns offer better strength than other patterns at lower infill percentages, making them an attractive option for those looking to conserve material and reduce print times without sacrificing structural integrity.


This particular pattern utilizes connected zigzag lines that alternate directions after each layer. The result is a stable and sturdy interior that offers excellent support to the outer layers while still maintaining structural integrity. Compared to other patterns such as honeycomb or gyroid infills, wiggle infills offer increased resistance to deformation under stress. The reason for this lies in how it distributes forces throughout its complex network of interconnecting lines rather than putting all pressure on specific points like other designs do.


The honeycomb infill pattern enables you to print parts that are lightweight yet strong enough to withstand stress and pressure. If you’re looking for a way to reduce material usage without sacrificing strength, then this pattern could be the solution you’ve been searching for. The honeycomb pattern provides better thermal insulation compared to other infills such as rectilinear or cubic.

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Standard Infill Percentages Recommendation for FDM Printing

When it comes to 3D printing, infill percentage is an important factor that can greatly affect the strength and durability of a printed object. Infill percentage refers to the amount of material inside a 3D-printed object that is used to support its walls and shape. The higher the infill percentage, the stronger and more robust your printed object will be.

Standard Infill Percentages for FDM Printing

Figurine & Model Prints

When it comes to creating figurine and model prints, choosing the right infill percentage is crucial. Infill percentage refers to the amount of internal structure that is present in a 3D print. This structure determines how much strength including durability, a print will have. It is suggested to maintain 0-15%.

Standard Prints

For standard prints that will not be exposed to extreme stress or pressure, an infill percentage between 15% and 50% should suffice. This range can provide enough stability while also minimizing filament usage and print time.

Flexible Prints:

Choosing an appropriate infill percentage can be challenging as higher percentages also mean longer print times and increased material consumption. Therefore, flexible prints require specific recommendations when it comes to determining an appropriate infill percentage. In general, the infill percentages ranging from 1% – 100% are sufficient for flexible prints as they reduce print time while still providing adequate stability and structural support. 

Functional Prints: 

For functional prints such as brackets or mechanical parts that require durability and strength, it’s recommended to use an infill percentage between 50% to 100%. This will ensure that the print can withstand stress and strain without breaking or deforming under pressure.

Which Issues You Must Consider When Determining Infill Percentage?

Determining the right infill percentage for your 3D prints is crucial. Because it directly affects the strength and quality of your final product. A higher infill percentage means more material was used, resulting in a stronger print. This also means using more material and increasing printing time.

  • The first issue you must consider when determining infill percentage is the purpose of your print. If you are creating a decorative piece that will not be subjected to any stress including weight, a lower infill percentage may suffice. On the contrary, if you are printing functional parts such as gears or brackets that need to support weight or pressure, a higher infill percentage should be used for added strength.
  • Another factor to consider when determining infill percentage is layer height and nozzle size.
  • The intended use of the object also plays a role in determining the infill percentage. Suppose if you are printing something that needs to withstand heavy weight or pressure, then a higher infill percentage would be necessary for increased stability and strength.


Infill percentage is an essential factor when considering the strength of 3D-printed parts. Using a higher infill will increase part strength, but it comes at the cost of increased material usage and costs. Ultimately, it is up to the user to decide the optimal infill percentage for their project. It is important to consider factors such as customer needs and budget when making these decisions. With careful consideration and testing, users can maximize the performance of their part through a selection of an appropriate infill percentage.

Hope you find my guide workful.