You can print your family tree with a larger font size by:
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Print on larger paper if your printer will print on larger sized paper.
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Decreasing the number of people that you are printing by changing parents, Children and Others under options.
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Increase the number of pages that you are printing for your tree. You can change the number of pages for both height and width to match how your tree is layed out. Tpically if you do this you will cut the bottom and right margins off of the sheets and tape them together.
Or some combination of the above.