Making a surface into a solid, help

[kellenraidfractal]

I have designed a curette; this is s surgical "spoon" used to scoop out soft tissue. The design of the business end is like an egg cut down the middle. I can easily add a handle, but the whole thing is just a surface.
Here is my question: how do I make this a solid so that I can print it? I tried copying and moving it a millimeter, but then to solidify (?) it, I had to draw a whole bunch of lines. If there is an easier way, I really need to know.

[driven]

start here http://sketchucation.com/forums/viewtopic.php?p=546771#p546771

read the whole thread and have a look at the skp file...

john

[pilou]

Generally Push Pull Interactive by Fredo6

[kellenraidfractal]

I got tgi3d and joint push pull. Together they worked well. Thank you for your help.