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Did a bit of googling on this as I've had the same issue - prints fine for the first hour or so and then the extruder begins to struggle with clicking until it finally fails completely - even though...

Far right? Is that the outermost one? Does it still click?

The adjusting/tweaking is half the fun though ;)

So after spending a few hours this evening manually extruding at different temperatures, rates and tension on the L-Arm, I've come to the conclusion that temperature isn't all that much of an issue....

My printer seems to be experiencing this also - however it's not due to misalignment of the cogwheel. I've managed to print a few objects (which turned out great!) but now the extruder seems to...