Why do my prints have a sine wave pattern as the ink is laid down?

The new ValueJet  printers incorporates a new printing technique called Intelligent Interweaving or "I²". This function is a series of wave patterns to virtually eliminate vertical and horizontal banding. Traditional inkjet printers lay ink down in a straight line, making it easy for your eyes to see the stripes in the print. The wave pattern of I² makes it harder to see that defined line.

There are a variety of 'Waves' available and you may want to try different waves for different graphic designs, i.e. images vs solid colors.

Wave 1 should be suitable for most applications using a good media profile.

Fine and wave and superfine and wave provide higher performance, but sacrifices more print time, you can see comparisons here:
http://www.mutoh.com/products/ValueJet/1204_Print_Speeds.html