Pete Zich pointed us to a great way to export to Shapeways from Maya. He took some screenshots and explains how to do it. Pete reports that, "I've uploaded over 20 items and all of them have been done this way, with excellent results." Thank you Pete! We will turn your info into a tutorial soon.
"The only steps involved are selecting the meshes you want to export, choosing "Export Selected" and selecting DAE_FBX."