Are there any print jobs left in those printers, probably with an
"error" status? That could cause the automatic removal of the
printer to fail.
If this is a one-time problem, you can clean up the printer by
deleting it from the registry on the TS. You'll find it under
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Print\Printers
But if the problem occurs again, I would closely monitor the user
and the printers while the user connects and disconnects.
Did you install any 3th party printer drivers for these printers?
If so, that could be the problem. If that's the case, uninstall
the driver and map it to a native driver on the server.
239088 - Windows 2000 Terminal Services Server Logs Events 1111,
1105, and 1106
http://support.microsoft.com/?kbid=239088