I've done more than 500 hours on the standard setup, including ABS PLA and Ninjaflex, so I don't think you need to replace the whole thing.
Regarding the thermocouples, if they look like this...
Type: Posts; User: noiseboy72
I've done more than 500 hours on the standard setup, including ABS PLA and Ninjaflex, so I don't think you need to replace the whole thing.
Regarding the thermocouples, if they look like this...
Hmm, how much thicker?
Mine are about 1mm - or 1 washer thicker. The only important bit is to ensure that the feeder hole lines up with the hot end tube.
Might be worth a little tweak and a play...
I found these: http://www.ebay.co.uk/itm/3D-Printer-Filament-Feeder-Extruder-Feed-Upgrade-Fit-Nema-17-Motor-RepRap-/191449385041?var=&hash=item2c9345c851:m:mBX35tGarlfvZl0hAxmaP-w
Will solve your...