Adobe Reader messing with print size

Printing from Adobe Reader shrinks the page “to fit” (by default). Unfortunately, its calculation doesn’t consider the existing margins of the document, so that it shrinks what it believes is your whole page onto what it believes is its output page. The effect typically looks as if your margins have expanded.

Solve this problem by adjusting the Reader’s default in the print dialogue; unfortunately, this dialogue varies from one version to the next: