Generate a two page PDF with 9 cards centrally positioned on an A4 page. There is a 3mm gutter horizontally and vertically between each card. Ideally print double sided on 300gsm card, and a couple of coats of clear spray lacquer on each side helps with feel and durability.

Generate a net for a tuck box to hold your cards. A reduced version of the front and back of your card appear on the box. Print onto ~200gsm card, cut along solid lines and score along dotted ones.