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Struggling with low quality 3D printing of STL files? Disappointed with the formation of large files during the process. Nothing to worry about. This blog is exclusively carved for you to take you through the detailed understanding of STL file types and its process of exporting and printing formats.
What is STL File?
STL is the extension for the file format and it is hugely confined to SLA 3D printing. In some online 3D printing services, this type is also referred to as Standard Tessellation Language.
STL file came into existence during early 1980s and was majorly intended for the CAD data conversion to the 3D print ready files of the time. Today, the significance of STL files is meant for easy prototyping and technology-driven manufacturing processes.
Standard Triangle Language, commonly abbreviated as STL is the preferred and reliable option for the 3D printing purposes. The whole concept is based on the sequence opf triangles that make up the surface of the model. It is also worthwhile to note that the CAD formats allow easy conversion to STL files for a quick and easy printing process. The process of conversion of 3D models into STL formats makes them ready to print.
STL File Format - An Overview
It stores the data about the 3D models. Surface geometry is taken into consideration rather than the common attributes such as texture and color or any other.
Let us also understand that the STL File Formats are active only during the last phase of 3D modeling wherein a CAD program will be existing till then. Initially, CAD programs were accepted for 3D printing services. With the inception of the STL formats, it became less prominent and conversion was encouraged for easy 3D printing services.
Methods of Exporting STL Files
Please take a look at the steps below to clearly understand how you can make your STL files print-ready! By doing so, you can reduce the costs incurred for 3D printing.
Have the proper idea on STL Resolution
STL utilizes the sequence of triangles that make up the surface of the model. When the count of triangles is increased, so does the resolution which would result in good results. However it will increase the size of the file for 3D printing.
In case of low resolution, the triangles would be seen on the model surface after printing. For sure, you would not prefer this. But this would help you to enhance the digital look and feel with the low poly models.
So, understanding the right resolution is really important. Let’s also understand that minute details will be difficult to capture. Because if the file size is increased, it will adversely affect the print design.
Key note on the Export parameters
STL files give you the flexibility you need in terms of resolution. The most preferred tolerance level adjustment is to set it high when you are looking to make STL files that can seamlessly get printed. STL parameters to be kept in mind include: Angle and the height of the chord that gives you the actual distance between the CAd surface and the newly formed 3D print surface. The ideal chord height includes 1/20th as that of the size of the printing surface.
Please note that you should never set the chord length below 1 micron because if its too low, then it would even affect the quality of the 3D print design.
When we say the angular tolerance, it generally refers to the angle between the adjacent triangles. By default, its value would be 15 degrees. The higher the value you set, the smoother the surface will be.
CAD Software is a Must Have to export STL Files
Once you have the Files ready, what’s the best way to export it? Of course, by using the CAD software. The process may seem unique for different platforms. Hence it is necessary to rely on the standardized mode to be efficient.
Hoep, the major factors that we have covered in this blog would help you in getting a proper understanding of how better you can utilize the STL files for your 3D print designs. Apart from the above, some more important aspects that you would need to consider include:
- Maintain the chord height upto 0.001 mm.
- Thumb rule is to maintain the tolerance angle to a maximum of 15 degrees.
- Never try to export the CAD file to STP format in case you feel the file size is too large.
By keeping these points in mind for your 3D print designs online, you can succeed with the affordable ways of printing 3D jewels, healthcare equipment or anything else. The best way is to outsource to a service provider who can make it easy for you. It is however obvious that you may find a good number of 3D printing companies that would help you with the best services.
Related Article : 52 Free CAD Software That You Can Use in 2022
Special Rules for the STL File Format
Here are some special rules that apply to the STL file format, which you should know about:
The Vertex Rule
According to this rule, every triangle should share two vertices with the adjacent triangles. This rule should be followed during the tessellation of a 3D object’s surface.
The Orientation Rule
This rule suggests that the orientation of a 3D object’s facet should get defined in two ways. The first rule states that the normal should point to the outer side. According to the second rule, which is also referred to as the right-hand rule, the vertices get listed in the counterclockwise direction. This rule guarantees data consistency.
The All Positive Octant Rule
This rule states that the coordinates of the vertices of the triangles should all be positive. This translates into the fact that the 3D object would remain in the 3D Cartesian System’s all-positive octant. The rule is meant to save space; if 3D objects are made to remain at any place in the coordinate space, professionals would have to deal with negative coordinates.
The Triangle Sorting Rule
According to this rule, the triangles need to appear in the rising z-value order. This rule facilitates faster slicing of 3D models.
How to Optimize STL Files
The STL file format replicates a CAD model’s surface to some extent using triangles. However, this is never perfect and the facets give the model a degree of coarseness. A 3D object having the same degree of coarseness as the STL file would get generated. However, if you go on decreasing the size of the triangles, you can improve the approximation and the print-quality at the same time. When you decrease the triangle-size, you would need more triangles to cover the entire surface. This would create massive STL files that most slicer would fail to process. Such huge files would also be difficult for you to upload. So you should know how to strike a proper balance between print-quality and file size. In some CAD software, you would come across certain settings while getting your STL files exported. Such settings determine the facet-size, file-size, and even the print-quality.
STL File Alternatives
Notably, the STL format is not the only 3D print-ready format; more than 30 3D printing file formats have been invented. OBJ is a widely-used file format, which can keep texture and color profiles saved. The Polygon (PLY) is another format that is used to save scanned 3D objects. Off late, The 3MF Consortium is looking to introduce a new file format called the 3MF format. It is expected that this file format would make the 3D printing process more efficient.
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