![]() They also wouldn't be able to target specific areas, such as the eyes or clothes of a model, for color changes. ![]() Chuck Hull, the inventor of stereolithography and 3D Systems’ founder, reports that the file extension is an abbreviation for stereolithography. To change colors on a single-filament printer, users would have to pause the print exactly where they want the color change to take place and manually swap out the filament. STL is a file format native to the stereolithography CAD software created by 3D Systems. ![]() Many of them don't even have the ability to extrude more than a single filament at a time, much less the capability to rapidly switch between them. Of course, not every 3D printer is capable of actually printing this information. This means that makers will be able to generate prints using different colored filaments. The other major advantage that OBJ has over STL is that it supports color encoding using a separate extension called the Material Template Library (MTL). This allows users to create designs with much more intricate and texturally diverse surfaces. To start, OBJ files are capable of supporting a much more accurate representation of surface textures since they aren't restricted to triangular tessellation.
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