Filament not extruding evenly

try tightening up the tension on the extruder, that screw that pushes the bearing closer against the toothed wheel that feeds the filament. looks like you might be getting some stripping of the filament as it goes in. i usually run at 195 on ABS, but since you say it happens at 200c too, its most likely a slipping issue.

also, have you done the extruder steps per MM calibration? normally SDs ship set to WAY overextrude. mine was taking 130mm of filament when i told it to take 100mm out of the box. you could have the odd one that's set to underextrude. or only take 75mm when you ask for 100mm. that could cause skippy layers. check the flowrate calibration after that.

last thing i can think of that might cause that result, is a partial clog. have you been careful to only heat the extruder when your going to move plastic through it and kill the heat the second your done? leaving it at temp for an extended period of time with no plastic movement will "bake" the ABS and cause little burnt crusties to form and enter the plastic stream and eventually clog the tiny nozzle.

you don't have to update the firmware directly, you can enter EPROM settings in repetier host. don't remember the menu name exactly as I'm on my tablet at work and don't have rh in front of me. but poke around a bit and you should find it.

my extruder did the same thing as yours when new, ask for 100mm it would take 130ish mm. simple step to change.

whats up with your firmware? i don't think you would need to wait for solidoodle to release something to be able to adjust your extruder steps per mm in Eprom. in RH its config>firmware eprom configuration. then once in there, on the first row, you'll see the first line with x,y,z,e with boxes + numbers beside them, these are your motor step per MM settings. simply change the number beside E to what ever your calculated number is. i think default is 130, mine is somewhere in the range of 102.45 after the 100mm calibration test.

after setting the E step to what you calculated it should be, mark another section of 100mm of filament and extrude 100mm to test, if your within a mm or 2, thats good enough. if your a little higher, try lowering the steps per mm by .05, a little low, add .05, etc. just don't use large numbers to make adjustments once you get close with the calibration steps. remember that this is steps per 1 mm, any change here will be magnified 25000x when your printing something using 25000mm of filament. lol

after getting that sorted to your satisfaction, set your flow multiplier to 1 (yes, 1). and print a test cube with 1 perimeter and no infill, i think there are some test cubes on thingiverse that are only 1 wall thick and top/bottomless so you can print with normal settings. use your calipers to measure the wall thickness. can use the same calculations as for extruder step/mm to determine the ratio, wall thickness should be .42 mm be default. with a 1 as your multiplier it will probably be .55 or more. by setting the multiplier to 1, its very simple math, simply divide what you should have by what you got. in this case: .42/.55 = .7636. set the multiplier to .764 and try another print, measure the wall, should be pretty close this time. can do the math again, or simply add/subtract+test.