Unresolved Robo R1 Layer problems

So I have 2 robos,one works great and the other one has been a nightmare. I keep getting gaps in my layers,its not every layer but its around the whole print and makes them look horrible. I have adjusted temperature,different filaments,messed with z offset,and layer height and its still having issues. I do have a little bit of z banding,so I was wondering could the z banding be causing the issues with the layers? I have no problem purchasing the new lead screw kit,I just wanted to know if that would help before spending the money on it. Thanks for the help!

 

Could you post a picture, it would help to see the type of gaps.

Have you calibrated the extruder steps? Small gaps are usually caused by not enough filament coming out.


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Definitely calibrate your extruder and there might be a partial clog in the nozzle: