How to change a surface part to solid part?

I have success create my forming block in surface =D. Now I want to change it in solid modelling for make a hole for cap screw and dowel pin. Anybody may tell me how to do it.

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2 Answers

You need to use the stitch command to join all the surfaces together. You then have the option to either leave them as surfaces or convert to a solid (default option)

 
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You can also, thicken the surfaces. Using the thicken tool.

 
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