What is the Print3D deviceType on Windows Print-Server
I asked Microsoft about this and I'm told it's a feature of Windows 10. As for why a regular printer shows as a 3D printer, still unknown. Could be a bug in the get-printer cmdlet.
When the devicetype is Print3D it means the hardware support for 3D printing is provided by the Printer hardware. With 3D Builder, you can scan, construct, and print 3D models in Windows 10.
Model and print 3D objects - https://support.microsoft.com/en-gb/help/4003696/windows-10-model-and-print-3d-objects
3D printing partners - https://developer.microsoft.com/en-us/windows/hardware/3d-print/printing-partners