there are several 3d designs of Lego Technic parts .can be these designs used to print Lego parts by using 3d printer ?if not , which other methods exit to get hard-copy of these designs .
You can try to print the models on a 3D printer, but the result will most likely be terrible.
Cost is another factor. Lego bricks cost about $0.10 each when purchased as a set, I suspect you'd need to print a lot of bricks (even if the quality was high enough) to offset the cost of the printer.
To get a hard-copy of the Lego models, check out www.lego.com
A site like http://www.brickowl.com will allow you to purchase specific bricks and colors if you are looking to create a custom model.
thank you very much dear FredSWUG