Some of the users can see all redirected printers. How can I make them see only their printers?
If some of users see everyone else redirected printers on Terminal server, the probably they are members of the Administrator or Power Users user group.
Check in users and groups for membership.
If this is the case there is no way to them from seeing all printer on terminal servers.
Only solution is to make them normal users again, and that way they will see only their printers.