I'm trying to draw a picture like this; a 3D model and some inner parts. What is the best software to do that? I would appreciate if you could help me draw this. I need a project so that I can add my own components.

enter image description here

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    There are many programs to do this. They let you create primary shapes, perform unions and substractions of volumes. What is your budget? Or do you want gratis, or open source? – Nicolas Raoul Jul 4 '16 at 5:38
  • Free software please. – Tina J Jul 4 '16 at 16:15
  • You mean gratis, costs zero, right? "Free software" can mean "open source" as well. – Nicolas Raoul Jul 5 '16 at 3:53
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    Yes, costs zero! – Tina J Jul 11 '16 at 2:11

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