Hello, all. So I've had some issues with extrusion for a while now. At some point, my R1+ did print without any real issues, but over time I've seen it get worse. There is some variation, but the primary issue is that most of prints are now coming out with horizontal gaps on an inconsistent basis. Here are some of the things I've done so far to address the issue: 1. Hooked up an oiler 2. Tried varying the temperature up and down 3. Replaced the hotend and nozzle 4. calibrated the stepper 5. Increased the extrusion multiplier 6. Tried printing through both MatterControl and Simplify3D 7. Tried multiple kinds of filaments, both new and old Some of these have helped, but I'm still seeing this issue. I can only assume it's a tuning issue. Does anyone have some suggestions at what else I might try to change that might address this?