Why I am getting this thickening

[dinac 0]

I sterted printing with ABS, and I am getting this things .

that thicker area is when it prints full solid layers without fill

 

[ian 32]

your thermocouple is loose and moving a little during printing, changing the temp values and then the temp is being shot back up to compensate, meaning more heat and different characteristics for your ABS ?

just an idea...

Ian

 

[msurunner 2]

Are those bulges at the same height on the two objects? They appear to be, which to me would seem that your z axis ball screw might be slightly out of adjustment??? Maybe check the platform screws around the bearings and loosen/re-tighten your ball screw coupler? The other thing to consider would be adjusting your flow rate. Since you are saying those are on solid layers I would think your flow rate is slightly too high.