Print. Use Print / Save as PDF, choose Save as PDF, set margins to None and scale to 100%. Page size is locked to CR80 trim (54 × 85.6 mm) — front on page 1, back on page 2, both at exact trim for a card printer.  •  Safe zone: keep critical content inside the green dashed guide (red = trim line, art beyond it is 3 mm bleed).  •  Photo: upload a portrait near 24 : 30 for a clean cover-fit.  •  Back topology: unique per card ID, drawn automatically from the 100-diagram library.