I just uploaded my first ever Shapeways model here: https://shpws.me/IaS0 My own version which I use on my printrbot has supports for printing the elevated / hanging USB mount in the model. I opted to exclude those from the model I uploaded to Shapeways since I figured they had industrial machines that could handle that type of overhang easily. Also, I wasn't sure how to indicate to Shapeways production that that part of the model was meant as support and needs to be removed post production. Am I right in this thinking?
Shapeways uses a different kind of printers. Take a look at a few videos such as this: https://www.facebook.com/Shapeways/videos/10153486702224879/ You don't need to indicate where to add support material. It is built into the process.
WOW!!! I had no idea how labor intensive their process is! Thank you for sharing that video its very informative.