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Imagine youвЂ™re going to copyВ the outline and shift it in the Z dimension by some amount. The ability in your 3D CAD package to extrude the outline to create a 3D model.Д®xtrusion is a pretty easy concept to grasp. A 3D CAD package that can read DXF filesДў.

Maybe you got that carb spacer drawing right off some carburetor manufacturerвЂ™s web site, and youвЂ™d like to work from a 3D model, whether because youвЂ™re going to use a 3D printer, or because itвЂ™s just faster and easier to use 3D with your CAM. LetвЂ™s say youвЂ™re given a DXF that you want to convert to a 3D model. The good news is that it is possible to convert a 2D CAD file such as a DXF to a 3D Model pretty easily in most CAD packages.

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But for more complex parts, it is often easier to keep track of whatвЂ™s going on and simpler to tell the CAM software what it needs to know if you have a 3D model. When thereвЂ™s only a 2D file available, the CAM software looks to the user to fill in the 3D blanks.

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In general, youвЂ™re selecting the various outlines, telling the CAM package what kind of feature they represent (pocket or profile), as well as what it needs to know about the feature (how deep is it, what feeds and speeds to use, how to enter and exit the cut, how many steps down to take, etc.).ДЄ lot of that information has to do with the fact that even though the model is 2D, a 3D part must be made. The process is pretty straightforward as this video showing that part being made with Cambam shows: In all likelihood youвЂ™ll want to use a CAM package to generate the g-code from your DXF. That depends on how you want to go about it.

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Tip: Check our library for free DXF files that you can use in your designs. Unless youвЂ™re planning to exclusively focus on 3D Printing, I recommend you make sure you CAD software can handle DXF files as they come up an awful lot for CNC work.

The most common file format for 2D work is AutodeskвЂ™s ubiquitous DXF format. There really are no interesting 3D features, it is the outline that makes the part and the outline is 2D. The part is flat on the top and the bottom. These are not so useful for making 3D parts, but they are still very popular for CNC work because a lot that goes on can be represented in 2D. While STL files are the most common 3D file format, there are 2D CAD files as well. STL files consist of many linked triangles (called a вЂњmeshвЂќ) that simulate the surface of the object you want to print. Most CAD thatвЂ™s 3D capable will do so, as STL is sort of the lowest common denominator file format. Most Slicer software works from an STL (Stereo Lithography) file, so make sure youвЂ™re using a CAD program that can generate STLвЂ™s. Some amount of hand tweaking of the parameters is needed for best results, but in many cases, Slicers are simpler software than the software used to generate GCodes for subtractive machining such as youвЂ™d need for a milling machine, CNC router, or lathe.

There are a number of different software packages out that can serve as your Slicer, and most 3D Printers come with one program or another. LetвЂ™s go through some of these different paths to give you a good idea of what kind of software youвЂ™ll want to have around to get the job of generating GCode done.ДЈD Printers typically use software that вЂњslicesвЂќ a 3D model of a part into layers, and then they generate g-code that extrudes plastic to fill each layer. The very next thing you will need to do is convert whatever representation of your part that you have into GCode, because thatвЂ™s what CNC Machines run.

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You might even want to start with a list of simple machining operations, much the way youвЂ™d approach creating a part вЂњoff the cuffвЂќ and without drawings on a manual machine tool. You may also need to start fromВ images, vector art from a drawing program, or perhaps some other file types. Most of the time this is a function of a CAD program, but not always. When youвЂ™re starting out with CNC or 3D Printing, the first thing youвЂ™ll want to get your arms around is creating some sort of model, drawing, or representation of your part.

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