Very often scanning could be used for duplicating existing objects. Since Printing & scanning is often combined - but only the printer hubs are visible, I think this add-on is usefull in many cases. Incase a Hub could provide both - this would be excellent - but at least the 3d print hub local-network could support users to the adresses who can provide this service & ask for a quote…
Yes-I think an add-on might do the job more easy, it will be possible to avoid lost time in case this service is required in order to prepare the print (due to absence of the .stl file - while having the physical object…) The combination of scanner + printer on one location could be a big plus…