Just some weeks ago I bought myself a Ultimaker Original + kit and assembled it. It works great with various things where exact dimensions aren't needed. But as I want to use it mainly for printing special parts for engineering, I checked if it prints the right measurements.
I started off with a simple 10x10x10mm cube. After it finished I first checked the height. It was perfect, exactly 10mm. After that I inspected the sides and for the y-direction the measurement wasn't that good, but still acceptable (around 9,93mm). Than I inspected the other side and it was only 9,65mm wide. I suspected some kind of error in the x-direction and therefore I wanted to try another thing.
For the next test I printed this piece for calibration: http://www.thingiverse.com/thing:195604
As before I checked the height first. It was perfect with exact 5cm. Than I inspected the y and x-directions. They should be both 10cm long. Keeping the previous results in mind I expected some major issue in the x-direction. But this time both sides have roughly the same value, 9,963cm in x-direction and 9,955cm in y-direction.
I am totally satisfied with the results for the second test. I know that the material (in this case PLA) shrinks when it cools down and I can live with these small variations, especially as they are nearly the same on both axis.
The problem is the wrong dimension for the x-direction of the first print. As a lot of the parts I want to print are relatively small I want some more accurancy here and as the result for the y-direction is much better I expect some kind of issue with the x-axis. Do you experienced the same problem or have a possible solution for this?
If you are interested in the printing settings:
Heated bed: 70°
Layer height: 0,2mm
Printing speed: 50 mm/s
Nozzle (standard): 0,4mm