Today I found out something very useful that makes the prints come very nice and clean.
When changing filament due to different materials and different thicknesses the feeder that drags the filament down might not gripping the filament as tight and as a result the prints would be like this picture.
Ok here is how to fix it. You should open the fan on the side of the extruder while the machine is on and running for loading filament. then after opening the fan and pushing the wires away then you would see a screw. This screw tighten and loosen the feeder against the filament. Normally when the machine is on load mode if you grab the filament it should not stop and has to continue feeding.When prints aren't well usually it is a bit looser so tighten the screw clockwise 15 minutes and try holding the filament to be fed if you could stop it you will need to tighten the screw more if you held it and it was still feeding through then it should be good enough to give you a very good quality print like this picture. Remember not to tighten the feeder too much because the result would be some extra noise and the filament wouldn't go through.
you can see the video tutorials here.
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