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.

2 Answer

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)

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