Not sure of the exact details as of yet, the Bluecam just came out and Sirona has not filled in all the blanks regarding the STL format, but the STL will be converted within the PC and won't have to go to infinitent. From what I understand, you scan the image and then save as STL and you send it to whichever system you would like (printer, another milling unit etc). On the flip side anyone can send to you an STL file and you would be able to design/mill for the sender, Opens doors both ways. Regarding the dongle, I do not know as of yet, from rumours that I have heard, if you already have a unlimited dongle you will be ok. If you are just buying the inEos Blue so you can scan and then subcontract your work then I will assume that a dongle of some sort will be required. More to come on the Bluecam within the next month or so. As far as cost is concerned, I am in the United Kingdom and I am not sure what the Sirona system costs there. UK prices are approx £16,000 (roughly $24,000). Again, some of this is rumours/hearsay, Sirona should be making more information available soon.
Larry