I very much appreciate the help. I have the whole object grouped. Entity info says "Solid Group". If I select the whole group, right click, and select "explode" I now have 7807 entities.
So I'm sorry, but I'm not really sure what you're asking me to do.
I've been pulling my hair out over this for days, so I appreciate any help.
I'm trying to make a very simple part. Just a solid cylinder with 9 hollow cylinders running through it. Everything looks fine, entity info says that it is a solid group with a volume, but when I try to have Shapeways print it I'm told they can't print it because the walls are too thin. In Sketchup none of the lines are closer than 1mm, so I don't understand what I'm doing wrong. Please help! Thank you for your time.