printing from Keynote

I started using Keynote a few weeks ago and discovered it is a very useful drawing tool.

I want to be able to print these drawings, not to view on the screen.

The problem is, when I print, although there are settings in preferences, the ruler and the Metrics Inspector for centimeters, it prints far too small.

Say I draw a 15 x 15 cm box, it prints out a 10 x 10 cm box which makes it useless for my purpose.

Other applications print out correctly; Photoshop, Indesign and Ilustrator using the same printer.

Can Keynote be set to print correctly?