Overlapping

Hi everyone,

I am trying to create a structure of elements that are joint one after the other like in the picture:

Even though the definition is developed for the elements to be moved on the right distance I get overlapping on some points. (please see screenshot)

I assume that the propbem might be either in the end on the extrusion distance or the point ofextrusion. Does anyone identify why?

Thank you 

Natasa