Calibration question?  

Calibration question?

I wanted to print a full height object to check my calibration (and I was bored). I sometimes get pushed out layers randomly and keep playing with the bed leveling. May someone tell me if this a calibration issue or Slic3r anomaly? Or something else? Newbie learning all this. I've been learning every slicer program has its pros and cons depending on the job and this issue might be my thin walls using Slicr3.

The test print is 20x20x200mm 0.40mm thick walls. Using PLA sliced via Slicr3 default Prusa 0.20 Normal settings. After about 5mm height was printed I increased the speed to 127% from the LCD panel. Impatient to wait as I really just wanted to do a height test. Images below show a Z shift at the top due to my bad. I had a pi camera bracket on the frame and didn't realize this limited my max height to about 180mm. A pause and removal of the bracket jiggled something... Oh well, ignore that.

Also, I actually only achieved 199.2mm before the Z axis pieces reached their max. So the last few layers just all squished and melted together. I was fully expecting the extruder to topple the model over but luckily it just melted itself thru! From what I suspect this is a bed height leveling issue on my end. But maybe someone here knows better.

The evidence
This angle shows the positive XY corner - the front. You can see some random layer extrud on the front and right sides going up

Conversely, from the back left corner the negative X and Y sides are smooth 0.20 all the way.