I continued to have printing issues and it took me a while to solve. I found that the filament drive stepper was clicking all of the time and had got worse over time. I had disassembled the hot-end many times but nothing seemed to help. I then compared the hot-end channel 1 with channel 0 and noticed that the heater block was loose on the hot-end feed tube on channel 0. This meant that the block was heating up ok and the temperature was reasonably accurate but the heat transfer to the hot-end was very poor. This resulted in me having to turn up the heat to around 250 DegC to get any amount of flow from the nozzle. So I tightened the feed tube onto the heat block and re-assembled everything , immediately it began to print like new again. I was able to back off the digipot values to 118 from 122 on the printer settings and no feed clicking was evident during extrusion. Happy days!
WARNING! modifications to your machine may damage it or cause a FIRE! you have been warned. Be CAREFUL with Hot things like your printer!
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