This way we make sure that we share not only the model but also how we want it to be printed. Print settings: Print settings can be included along with the models (using, for example, Prusa Slicer).Thumbnail: You can change the thumbnail of the file, using, for example, a render of the model.Color and texture information, like OBJ.Scene composition information: A 3MF file can contain several separate models and save them as different models belonging to the same scene.Scale information: Models have scale and units so we will always have the same size regardless of the slicer we use.In addition to preventing errors, a 3MF file includes much more information, as it can compress other files and encapsulate them in a single package, as we do when using a ZIP file: The models we export as 3MF will be validated to avoid all these errors, so we can be sure that our file can be printed in 3D. These problems, resulting from poor modeling or poor export, can be prevented by using the right file format, as is the case with 3MF. In this case, we are not limited to triangles, but other polygons can be used, so, despite being only an approximation of the original geometry, we can get smoother finishes. An OBJ file that uses approximate coding generates a simplified version of the model’s surface through tessellation, as it happens with a STL.This means that, using an OBJ we can capture the “original” geometry of the model, not an approximation built from triangles. Instead, it will preserve the original geometry of the model using three-dimensional lines known as NURBS (Non-uniform Rational B-spline). An OBJ file that uses precise coding will not tessellate the model into triangles, as an STL does.This format is much more complex and has several modes of operation: precise mode and approximate mode: The OBJ format, although less known than STL, is also very popular and almost any software related to design or 3D printing supports it. This format is, nowadays, the most used to share models for 3D printing, although it is definitely not the best, since there are more modern formats that use less space and add more information. In spite of being lighter, binary STLs still are too big if we want to give a lot of resolution to an object, since we will need to include many triangles. There are several nuances in the operation of each, but keep in mind that the binary STLs are somewhat smaller and appeared as a response to the increasing size of the ASCII STLs.
There are several STL file types, but the most common are ASCII and binary.
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