My Wanhao is confusing me again. I changed the extruder from the normal one with a pinch wheel with fixed pressure that it came with to this one: http://www.thingiverse.com/thing:147518

My nozzles are 0.3mm and the extrusion thickness prior to changing was 0.6 mm, once changed it is coming out at over 0.8 mm and I have no idea why, same plastic, same temperature, same everything apart from the roller now applying pressure from a spring instead of being fixed.

Makes me think that this is going to affect the printing but I can't see any difference on the finished prints.

I suppose if the new extruder is not pushing as hard onto the toothed stepper gear then that means that the diameter is effectively bigger and more plastic will get through maybe.

Any thoughts?