Hi Fred,

Thanks for responding. I've asked this question on other forums for the past several days and you are the only one that responded. I think I didn't write my question clearly. I've determined that it is not the temperature or the filament. I visually observed the extruder and notice that when traveling between two separate parts, the extruder motor won't retract some times. The retraction works pretty well as long as it happens within a single part. That is why when I printed two sets of stringing test posts (4 posts total), there are almost no stringing within one set of posts, but lots of staging between the two separate sets. Again, the motor seems like it randomly fail to retract during travel between parts. If I print just a single part, retraction is almost flawless and very little stringing problems using the same temperature, filament and same cura profile. Thanks.