This a known problem with Claris CAD and the StyleWriter Driver, particularly if the drawing size of a document is greater than 91.01", horizontally or vertically. If you go to "Drawing..." in the "Layout" menu and change the height and width of your drawing size to 91.01" or below, the StyleWriter will print the proper scale. If you can't modify the drawing size then go to the Layout Menu, choose Preferences..., select the Printer icon, and choose "More options, less resolution".
Note: This problem may be fixed with the StyleWriter 7.2.2 and the StyleWriter II drivers.