Try re-calibrating your e steps by following the Extruder Calibration OHAI, but use 40mm/min extrusion speed, rather than the 100mm/min stated in the OHAI (40mm/min equates to something much closer to the feed rate for a typical print speed). I can almost guarantee you will get a lower e steps number (mine went from 866 to 825). I had almost exactly the same ripple. Fixing the e steps and putting in a more accurate filament diameter (went from the Quickprint profile default of 2.85 up to 2.89mm) both greatly reduced my over-extrusion problem, eliminating that ripple you noticed.
This was discussed in more detail in the thread: Can’t get prints to correct size, where the gurus here set me straight and made a huge impact on the quality of my prints.