@Bill I Tried to reply ot this and apparently it never took, I'm using an EZR Struder, which I bought because there was a 3d printed mount for using it with the 3dchameleon, and also it feeds and works extremely consistently, the e xtruder that is, not the 3d chameleon, The issue I have is similar to the recent "I give up issue" where either it can't feed the extruder because it's not strong enough to feed it with the normal spring, and any weaker spring used, means the EZR Can't actually grip the filament to extrude, or it is constantly getting stuck in the Y adapter either retracting or feeding.

I have been fighting this thing for months now, and I am steadily getting tired of it, I have tried multiple extruders, and they either "Grip too tight" SO the 3d chameleon can't feed to the main drive extruder, or "Grip too loose" So they don't feed/retract at all @_@ I was considering going "Jus tmake it the extruder but now I see that it's juts..a big mess here ...I'm really starting to regret buying this thing @_@ It's pLug and play, but its plug and play "If your extremely familiar with 3d printers and know how to debug and fix everything and knowledgable." >.<

I think the issue is default Cura Gcode assumes your telling it to use "Reprap" style gcode, not "marlin" style gcode, might be the issue.

Im having this exact same issue, and I had my "Print speed" set to 60/mms, but it was trying to behave like it was set to WAY higher then that,