I designed a cover for a magazine in Word2011/Mac.
On the screen the colors fill to the edges.
However when I print, there is a small white edge on the 4 sides.
Who knows how to solve this problem?
Thank you in advance!
(When you want to see my model, please ask)

What you're seeing is a limitation of your printer, not Word. Most printers have a small non-printing area around the edges for paper handling. Full-page bleeds are possible with many photo printers, however.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Printing to the edge of the paper is not something most printers can do. Think of where the excess ink/toner would end up if it missed the edge - this would rapidly degrade any subsequent outputs if it were allowed to happen.

Commercial printers print onto larger pieces of paper (or a massive roll) and then, when the ink is dry, they trim the edges with a guillotine to make it the final page size. If you need to get full bleed output then you will need to do the same or send it to a commercial printer who can do it for you.

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Andrew Lockton
Chrysalis Design, Melbourne Australia