I have a CTC dual extruder printer (bought from here: http://www.amazon.co.uk/gp/product/B...ilpage_o02_s00)

I got one print out of it before the filament from the right extruder started bunching up on the print head and I end up with a ball of plastic. The left extruder is fine.

I have tried levelling the print bed, still not working. I'm pretty sure there is not a blockage, as filament is still coming out.

This is using PLA at 210C with the print bed at 90C, any suggestions?