FoldaRap build

Hello everyone, this is a duplicated post from my topic in the FoldaRap forum:

[forums.reprap.org]

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So the build is finished and the electronics now work and the printer moves!

However I am having trouble getting printer to print properly. Straight lines are.. Passable..

Circles however.. are very poor. I have attached a picture of a printed 20mm calibration cube and then a circular z-axis limiter I have tried printing which is simply not circular.

I have ensured the Z-axis extrusions are parallel and the steps are set to the point where the 20mm cube is 19.98mm on one side and 20.08mm on the other (which I am happy with) but circles just fail miserably.

I would love some help with this..
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Looks like loose belts or loose pulleys.

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