From [here](http://articles.baltimoresun.com/1997-08-28/features/1997240163_1_fashion-leather-fur-trim)

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> September Vogue weighs in with 734 pages of **heavy print**, Bazaar with 488.
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What does "heavy print" mean?

Other examples:

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> Old habits die hard. Respondents ages 65 and over were almost three times more likely than the average respondent to be **heavy print** newspaper readers.
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> The use of different media has changed dramatically over time. It is a cliché that reading is in decline. But on the other hand we get considerable information from the Internet, which is a **heavy print** medium.
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Google and Wikipedia searches return nothing concrete.

I found a similar question asked [here](https://forum.wordreference.com/threads/heavy-print.1781527/), but not really of use to finding the definition.