When using one-off teams (login without registration), players need to be given physical or digital access cards. QEng provides a built-in print utility to automatically layout cards with QR codes ready for printing on standard A4 paper (or others).
/game_admin/teams_print_setup.php?gid=GAME_ID).The settings are on the left, a live preview of the sheet on the right: it is redrawn on every change, so the grid and the sizes can be dialled in without printing anything.
Worth knowing separately:
Printing goes the usual browser way (Ctrl+P) — what you see in the preview is what reaches the sheet.