I saw a Makerbot Replicator a few months ago and it did something that intrigued me. When it was printing the line to prime the nozzle before launching into the print proper, it wiggled... To be more specific, when it started printing the prime line it was a straight line on the X-axis, but as it moved across the plate it added a successively increasing orthogonal Y-axis modulation to that. By the end of the prime line the Y-axis modulation was about 2mm peak to peak in amplitude. The frequency of the modulation was fixed throughout the line at about 4mm per cycle. Has anyone ever seen something like this this, or a GCode script for generating this motion?