How do I check if my object is solid?

[risex]

This save me from a lot of headaches. Thank yo uso much

[ozric]

That was such a great help for me, thx.

[mattfarrar]

Well this is useless for the normal person without pro using it at home...

[prince]

thank u so muck, you saved me alot of time

[akramal-khazzar]

I use push/pull button to make 3d object but sketchup still saying that is not soild!

[Eren-dquj]

If sketchup says it is solid and then I export it in stl and print it. Will the shape be filled?