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I am planning to build a robot.

1) What free or low cost robot modelling tools exist.

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Here are some that I know of:

Solidworks student edition: http://www.solidworks.com/sw/education/cad-faq-students.htm (Free for students who use a school's privately assigned password, otherwise $149)

AutoCAD Student version: http://students.autodesk.com/ (Free for students)

Google Sketchup: http://www.sketchup.com/products/sketchup-make (Free)

FreeCAD: http://www.freecadweb.org/ (Free)

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  • $\begingroup$ Blender is worth being added here (I'm adding as a comment since the thread is closed and I can't post a new answer). $\endgroup$
    – IsaacS
    Commented Aug 24, 2014 at 12:56
  • $\begingroup$ I created a video where I show how to get the moving graphics of a mechanical arm youtu.be/crJXUlzJ918 $\endgroup$
    – LCarvalho
    Commented Feb 14, 2018 at 23:27

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