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FUNdamentals of Design - Practical resource
For 2D cutting,many online service provides accept or import DXF files. If you are processing acrylic, and a few other plastics, we recommend laser cutting. Nearly everything else can be processed with a water jet. Typically all you need to do is upload your file, select your stock material and thickness, and review the quote. Here are a few excellent service provides that we use:
Protolabs and eMachineShop also offer excellent 3D milling services. Standard 3D CAD files can be easily uploaded and reviewed online.
For 3D printing, additive manufacturing, a quick web search will confirm that numerous online options exist. Here are a few companies that have served us well.