RDP Letting Rremote Printers Through

RDP only redirects the standard ports, not tcpip or Brother etc, just...
  COM, LPT, or USB

On client go to registry
HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default\AddIns\RDPDR

Add DWORD FilterQueueType
Value ffff ffff                             8 of them

See
  https://support.microsoft.com/en-us/help/302361/printers-that-use-ports-that-do-not-begin-with-com,-lpt,-or-usb-are-not-redirected-in-a-remote-desktop-or-a-terminal-services-session

Also
  https://www.petri.com/forums/forum/client-operating-systems/windows-2000-pro-xp-pro/22871-network-printer-does-not-redirect-in-rdp-session

And a very complex solution by divrdrew
  https://answers.microsoft.com/en-us/windows/forum/windows_7-networking/win-7-remote-desktop-and-local-printing-not/544acb1b-a259-4170-bc05-2c6dbfd0ca05

And another way
  http://www.proposedsolution.com/solutions/remote-desktop-connection-rdc-printer-install/