When switching from ABS to PLA it is VERY common to get a clogged nozzle - partial or full. ABS if left host (above 220C) for more than 20 minutes can transform into a permanent clog.
I would first try cleaning it with the "atomic" method.
http://umforum.ultimaker.com/index.php?/topic/4118-blocked-nozzle/?p=33691
Maybe try 3 or 4 times. If it doesn't seem better you should do complete dissassembly, burn out everything in nozzle (and test white teflon piece while you take it apart) and also soak it in acetone which will dissolve the ABS. Maybe for an hour:
It's not that hard to take it all apart:
1) Remove filament.
2) Remove 4 screws holding fan sheet metal thing - let it hang by wires.
3) Unscrew 4 very long thumb screws.
4) Remove the 2 screws holding that 3rd "rear" fan on - careful as there is a strong spring as you can see so hold it together with one hand while unscrewing with the other and alternate screws.
5) Remove the white teflon piece (inspect it by passing solid filament through it to make sure it hasn't smushed overly small.
6) Heat nozzle to 180C before next step or you will destroy the nut (solid PLA locks the threads) - rotate the nut with holes in it by inserting a small screwdriver all the way through two opposite holes. This frees the nozzle. Once it is free turn heat off again but no need to wait for it to cool.
7) Remove very skinny long headless screw before removing temp sensor or heater as these are held in by that long skinny thing.
8) Remove temp sensor and heater gently - make sure you do step 7 first!
Now you can put the nozzle in flame. Don't leave it in too long as even nozzles can melt but heat it enough to burn anything made from trees.
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gr5 2,224
Picture is very blurry but it looks like it might be underextrusion. Please post pictures and videos directly here. Here are instructions:
http://umforum.ultimaker.com/index.php?/topic/4525-how-to-upload-an-image-to-the-forum/
This looks completely normal. It is supposed to skip backwards like that when loading new filament.
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