For true-to-size 2.5" × 3.5" cards: use Letter paper, scale 100% (not "fit to page"), and turn off headers/footers.
CATADB PROXY
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CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
CATADB PROXY
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CATADB PROXY
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CATADB PROXY
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CATADB PROXY
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