I own a stratasys 3d printer and while the parts that come off it are a solid ABS and are very strong they will never replace the real thing and this is the same for all rapid prototype items.
I have often printed something off for my car or the odd job and its been fine but I would not use it for anything critical...
3D printing is fine but the trend for the cheap FDM printers has brought many low quality printers out. All 3D FDM printers need a heated chamber or they are useless. Mine is huge but a professional outfit
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