OK, for 2 weeks now I've done everything I can think of, gone through the calibration section numerous times, read every forum post I can find yet still cannot get my Dual calibrated and printing. My first problem is that I could not get the Estep calibration working no matter what. Right now I'm just working with the left head and setting things up per the build guide, loading defaults and trying to extrude 100mm of either PLA (at least I think it is PLA since it is what was sent with the kit and there's nothing to indicate what it is) or ABS results in the same issue. The filament starts to feed then stops, restarts, sometimes jumps and many times the hob chews half way through filament. I've tried temps up to 220 on the PLA and 260 on the ABS with no luck. The only way I could get it to reliably feed 100mm of filament was to modify the Gcode to change the feed rate from 200 to 50. I was able to use the slower speed to go through the measure, feed, calculate, update Estep retest cycle until I can reliable feed 100mm but ONLY at the slower speed. Thinking I at lease had the feed calibrate I've tried using S3D to print a 20mm test box. I've done the IR calibration with the belt segment numerous times and done the bed leveling even more times using thinner and thinner pieces of paper yet when it goes to print the filament will not stick and everything gums up on the head. I've tried different bed temperatures, cleaning the glass throughly to remove finger oils, blue painters tape and even 30 minute temperature soaks per other forums on 3D printers trying to get filament to stick. I can't help but feel that the may revolve around my inability to get the filament calibration to work with "normal" feed rate but I'm out of ideas. Also, just to make sure. Using S3D I select "other" from the printer choices, load the dual.fff and change temps and stuff for the material I'm playing with right? Suggestions? Ideas? Forum posts that might address this? (I sure as h$^& can't find one) Any help would be greatly appreciated. It's very frustrating to be so close and to see what others can accomplish with their Duals yet I can't even get a single print head to work. Thanks for your time and any help you can provide.