hey guys thanks a lot! i will give it a go....

hello all, I'm new to sketchup... using version 8, about to buy pro v8... im using Mac os10 snow leopard....i need to do a 3d print from my drawing, my 3d printer is asking for STL format only. sketchup dosn't support STL export... can somebody walk me through what i need to do to turn this sketchup drawing to an STL file?...are there plug-ins for mac users for STL import/export? where can i find? how do i install? is it worth it for me to buy pro since i will need to export to STL? thanks for your help...Thom