How to Convert OBJ Files to STL: Complete Guide

OBJ (Wavefront Object) and STL (Stereolithography) are two of the most popular file formats used to save 3D models for 3D printing. The OBJ file is used to store information related to faces, vertices, the model’s geometric data, and coordinates of a 3D object. 

On the other hand, STL contains the surface geometry of a 3D object in the form of a collection of connected triangles.

It is typically used by all types of printers, such as resin 3D printers. Since both OBJ and STL files contain important information, many want to learn the process of converting OBJ to STL. We will discuss this complete method in detail.

Understanding OBJ and STL File Formats

OBJ and STL file formats are used by many different types of 3D printers and software platforms because they are neutral. Such nature also optimizes interoperability to enhance the entire process of 3D modeling and printing. 

1. What is an OBJ file?

OBJ file was developed by a company called Wavefront Technologies during the 1990s. This is the reason why the file format is also called Wavefront Object. 3D printing, gaming, animation, and computer graphics are some of the key areas where the OBJ file plays a vital role by storing the following information:

Geometry Information: The OBJ file has fewer faces than the STL, so it offers more precise information related to vertices, edges, and faces.

Texture Condition: An OBJ file also contains data about the texture applicable to the model.

Vertex Normals: Data relevant for lighting and shading.

Material: Generally, OBJ files are accompanied by MTL files that contain material properties, such as color, reflectivity, texture map,  and other key attributes.

2. What is an STL file?

STL (Stereolithography) is the standard file used for 3D printing. OBJ files are quite large in nature as they contain a lot of data, but only geometry information is required for 3D printing.

This is possible via STL files that contain the surface geometry of a 3D object using triangles. Some of the key features of the STL files are:

Only Geometry Information: STL files contain only the information relevant to the object’s shape.

Compatibility: All major 3D printing software and printers support STL, such as resin 3D printers, to ensure universal compatibility and quick integration.

File Storage: STL can be stored in both binary and ASCII file formats.

Overall, STL is much simpler and more efficient for 3D printing than OBJ.

When to Convert an OBJ File to STL?

Here are the key reasons why you might want to convert an OBJ file to STL:

STL file format is universally accepted by 3D printing software and printers. While some modern printers can print from OBJ files, it is recommended that you convert OBJ to STL for more accuracy.

STL files are also easy to handle in CAD and modeling software/

OBJ files have a large file size as they contain much more data than STL. So, converting OBJ to STL is a reliable way to reduce the file size and simplify it.

Most of the 3D models available online are in STL format. So, if you are also planning to upload or sell your model, you should do it in STL format.

Tools to Convert OBJ to STL

Converting OBJ to STL is a popular process that many people do regularly. As a result, many different tools and methods have emerged that can help you convert the OBJ files to STL. We’ve picked some of the top tools for you to convert OBJ to STL:

1. IMAGEtoSTL 

IMAGEtoSTL is an online OBJ to STL converter. It is a quick and free tool that you can easily access on your web browser. It is our top pick to convert OBJ to STL because of its high accessibility and user-friendliness. All you need to do is:

Step 1. Open IMAGEtoSTL on your web browser.

Step 2. Upload the OBJ file by either pressing the + button or by dragging and dropping your file. Keep in mind that the maximum OBJ file allowed is 100 Mbps.

Step 3. You can use the Options section to choose specific settings and optimize the conversion process. Once the file is converted, you can easily use 3D printing software to print it using a resin 3D printer for maximum quality.  

2. Blender 

Blender is one of the most popular computer-aided design (CAD) software. Many people use Blender to design 3D objects, models, and animations. Using Blender to convert OBJ to STL file is quick and easy:

Step1. Download and install Blender from its official website.

Step2 . Import your OBJ file.

Step3. Use the Export option and save your file as STL to convert it.

3. Puraslicer

Another method to convert OBJ to STL file is through a 3D slicer software like Prusaslicer. This method is similar to using Blender. All you need to do is:

Step1. Download and install Puraslicer.

Step 2. Import your OBJ file.

Step 3. Export the file as STL. 

Things to Check for the Conversion

The quality of your STL file can also affect the 3D pricing. So, you need to keep the following things in mind to ensure an OBJ file is converted into an STL file correctly:

Identify Manifold Errors: Manifold errors mean any gaps in the file that can cause printing issues. You can use software like Blender to identify and fix such issues.

Model Complexity: If your OBJ file has an extremely complex model, there is a high chance that you’ll face issues in conversion and printing. So, you should try to simplify the model before conversion.

Verification: The conversion process does not end with downloading or saving the converted file. You should also verify it to ensure there are no distortions or errors.

Use Authentic Tools: The tools discussed in this article are some of the most reliable and authentic tools you can find to convert OBJ files to STL files with maximum accuracy.

Ultimately, keeping these things in mind will help you enhance the conversation’s accuracy and quality.

Conclusion

The conversion of OBJ to STL is an essential step in 3D printing. It plays a vital role in bringing a digital model to life via physical printing.

With STL having universal compatibility, it is a no-brainer that you should use the tools and follow the steps discussed above to convert OBJ to STL and enjoy the benefits of quality 3D printing.

If you want to further enhance the quality of your printing, you also need to make sure you are using the best resin 3D printer that can handle the converted file and print as per your requirements!

FAQs

Can OBJ files be 3D printed?

Yes! OBJ files have gained significant popularity, and many newer 3D printers can print directly from these files. However, these files are large and have lots of unnecessary information, so it is recommended to use STL files for 3D printing.

What files can be converted to STL?

You can convert many different types of files into STL, such as OBJ, STEP, BREP, LYS, etc.

What is the best software for 3D printing?

Autodesk Fusion 360, SketchUp, TinkerCAD, and Blender are some of the most popular software for 3D printing. 

 

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