Okay, so I have this 
and I can cut it so when I 3d print it I can take off the head and have something in side of it like an Arduino Uno and other stuff
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$\begingroup$ Out of curiosity, what was the reason to return original version of question with spelling and wording errors? It doesn't become clear because of that $\endgroup$– Mr ZakCommented Jul 17, 2017 at 15:14
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1 Answer
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Go to Edit mode.
Select the vertices or faces of the part you want to separate and press 'P'.
This opens the 'Separate' menu, where you can choose 'Selection'.
That's all. Now you will have that part as a separate object.
