Hi,
Yes, S5. I was using AquaSys 120, and I have been thinking that as the spool gets smaller, the bend memory gets larger and that filament is stiff, like glass. I ham going to turn off flow sensor and see what happens if I print again. I have "modified" the flow sensor with zip ties to shorten the gap inside the unit to hopefully keep the feed from jumping out of track. Wish me luck. LOL