Understanding the Key 3D Printing File Formats

Understanding the various 3D printing file formats is crucial for achieving optimal results. Different file formats serve different purposes, each offering unique advantages depending on the complexity and requirements of the project. This article will introduce and compare the most common 3D printing file types.

1. STL (Standard Tessellation Language)

File structure: STL files use triangular meshes to represent the surface of 3D objects. Each triangle is described by its three vertices, which are expressed in coordinate form.

Use: Most commonly used in technologies such as FDM, SLA and SLS, and is particularly suitable for monochrome, single-material printing tasks.

Limitations: Since STL files only describe the geometry of the model, they cannot convey information such as color, texture, and material. This makes it inapplicable in complex printing tasks that require multiple colors or multiple materials.

Application range: Almost all 3D printing software and 3D printers support the STL format. It is the standard file format for industrial and personal 3D printing, and is also the most mainstream file format for 3D printing.

Source: Wikipedia

2. OBJ (Object File)

File structure: OBJ files support polygonal geometry descriptions and allow the storage of vertex positions, faces, normals, texture coordinates, and other information. It is usually used in conjunction with MTL files and maps.

MTL files: Used to specify material information for each part in the OBJ file, such as surface color, glossiness, texture mapping, etc. It stores material properties in a simple text format and can reference external image files (such as JPEG or PNG format) to define the texture of the model.

Purpose: OBJ files are often used in full-color printing, complex models, animation, and computer graphics. It can retain color and texture information, so it is very suitable for full-color 3D printing.

Limitations: Although it supports more information, OBJ files are larger than STL files, take longer to process, and have higher storage requirements.

Application range: Commonly used in 3D printing projects that require complex materials and colors, and are also common in 3D modeling, animation, and game development.

Source: https://stackoverflow.com/

3. 3MF (3D Manufacturing Format)

File structure: 3MF files are based on XML format and can contain all the information required for printing in one file, including color, material, texture, geometry, unit, mesh information, slice settings, etc. It aims to simplify and improve the 3D printing process and avoid the limitations of file formats such as STL.

Purpose: Suitable for modern 3D printers and software, especially for printing tasks that require multiple materials and multiple colors. It is very suitable for industrial-level printing needs.

Limitations: As a newer format, 3MF files have not been as widely adopted as STL, but their advantages have led to a gradual increase in usage.

Application: Some modern 3D printers, Microsoft's 3D Builder, Ultimaker Cura and other slicing software support the 3MF format.

3MF file open in Microsoft 3D Builder

Source: https://fileinfo.com/

4. AMF (Additive Manufacturing File Format)

File structure: AMF files are also based on the XML format and can store more model details, including geometry, color, material, texture and printing-related metadata. It allows the model to be layered, and each layer can define different materials and colors.

Uses: Suitable for complex multi-material and multi-color printing projects.

Limitations: Like 3MF, there are fewer devices and software that support it, and it has not yet been widely popularized.

Application: Mostly used in industrial projects that require high precision and multiple materials, as well as some scientific research projects.

5. G-code

File structure: G-code is a numerical control language that directly controls every action of a 3D printer. The G-code file describes operations such as the movement path, speed, extrusion volume, and printing temperature of the print head. It is usually generated by slicing software and is based on STL or other format model files.

Purpose: Applicable to almost all FDM 3D printers, controls the movement of the print head, and is the core instruction language for 3D printing.

Limitations: G-code is printer-specific and is usually optimized for specific hardware and cannot be used across different printers. In addition, it is not suitable for describing the geometry of the model, but only for controlling the printing process.

Application scope: G-code files are the final control files of most FDM printers and are output files generated by slicers.

6. PLY (Polygon File Format)

File structure: PLY files are mainly used to store geometric data obtained through 3D scanning. It can save detailed information such as vertices, faces, colors, normals, etc. of the model, and supports multiple data structures (such as polygons such as triangles and quadrilaterals).

Purpose: PLY files are mainly used in the fields of 3D scanning and computer graphics, and are particularly suitable for printing complex models containing color data. Commonly used for 3D printing reconstruction after scanning.

Limitations: PLY files are relatively complex, slow to process, and more professional to use, suitable for scientific research and high-end applications.

Application range: Commonly used in scientific research, storage and printing of 3D scan data, suitable for 3D printing projects that need to retain color and surface details.

Source: https://people.sc.fsu.edu/

JLC3DP supports 3D printing orders in mainstream file formats including STL, OBJ, PLY, 3MF, etc., which can meet a variety of printing needs. Feel free to contact us anytime for more information on file format compatibility and our printing services.