Howdy. I'm trying to export a ring I designed for my girlfriend to STL. It has 2 parts, the ring body and then a small hoop that passes through a turnbuckle. The parts are independent, and the whole point was to have it produced with them joined. However, STL export in ACAD 2009 is telling me I can only export 1 item, not multiple items. Do I need to draw a sprue onto them conjoining them? Would it be best if I just used a line to do so, or make it smaller than the tolerances of the material I intend to print in since I am going to be removing it anyway? Thanks.