Layers vary in quality

[redmesh 0]

Just one thing to fix, the layers vary through the print in quality, it may be blobbing, I can't tell if the extuder is slowing or the temperature is the problem. I generally use 200c. It started very well, hopefully the picture is clear enough.

[IRobertI 438]

My uneducated suggestion is: Have you checked if your filament is slipping during the print? Check to make sure that the hobbed bolt is clean and that the tension screw is tight-but-not-too-tight

[owen 18]

I agree with I Robert I. Also, are you using Marlin for firmware? It has very good temperature regulation.

[redmesh 0]

Cura RC3 and Marlin, yes it could be the filament slipping. Mind you I can see the teeth marks on the filament as it passes the cog, maybe it's too tight?

[IRobertI 438]

If it's super tight or if the PLA is softer than normal you might be squishing it so hard that it deforms so much that it starts having trouble getting through the bowden. Personally I doubt it though as PLA tends to be pretty darn hard. But it's worth checking out, yank out the filament (while the hotend is hot of course) and try to pass it through the bowden by hand and see if there's a lot of friction.

Another thing might be that the stepper is getting just barely enough current to do its job properly. Maybe there's a kink in the PLA that makes it harder for it to pass through the bowden from time to time and the motor is just on the borderline of being able to push it and starts skipping steps. I'm pretty sure you'd hear that happening though as it would change the sound of the machine. Random thought though

[redmesh 0]

I think it is the filament cog/feeder is slipping. I cleaned the hobbed bolt. I checked the assembly documents again. The delrin clip I'm not sure about, that's supposed to be on the hobbed bolt, what it looks like though I'm not sure I can't see a picture of it. I have only had my ultimaker a few weeks so it's pretty new.

[redmesh 0]

Thanks for the replies. I increased the temperature, I was using silver filament at 200c, now 215-220c seems much better.