First a little background. I bought a used Robo 3D kickstarter and have added auto level, E3D V6 hotend, linear rod Y axis and just installed lead screws with parts from China from the thread in the upgrade forum. I've had several issues since I bought the printer, but didn't want to post anything until I got my mods all installed. First issue is an odd pattern of filament lay down. I'm using Matter Control with some modified settings as I made changes to the hardware but nothing major. The issue was seen using the Robo PLA black filament that I was given with the printer, no idea how old or how it was stored. The issue also shows up on the Robo PLA blue filament (blueberry smellament actually) that I just purchased. I thought it might be an extruding issue, but the pattern doesn't seem to match the rotation of the hobbed bolt. I checked the tension of the filament, and it doesn't seem to be related to tension. I've calibrated the extruder as it was 8mm under on 100mm extruded, adjusted in the firmware. I'm running the E3D V6 with the 'sock' and currently have Matter Control set to 200. Any ideas on what might be causing it would be greatly appreciated!