[Koha] Possibility of Printing a Patron's Card More than Once

Hello All, I need to print self-registered patrons' library cards in batches, just as the patrons register per day but I discover that I can only add patrons to a card batch by searching or browsing by a criterion, say department or faculty or last name. This leaves me with the possibility of printing a card for a patron more than once since I can possibly (by oversight) add the patron to more than one batch. I am looking for a way to avoid this possibility of duplicating patron cards' printing. Please, can anyone advise me on how to go round this in koha? Thank you. Olufunmilayo FATISystems Librarian, Nigeria