If you are over extruding, and you calibrate the printer steps for x and y with a test print, the values will be inaccurate.
Also true… Will print a couple of test cubes! Thanks 
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Buy a proper z couplers from printrbot. It will fix the majority of your problems.
Hi everyone; thanks for the replies! The problem was the wooden coupler and the nylon nut-thingy. After a year of printing it is worn out causing clearance - the rod could move how it want to move.
I ordered a better coupler.
Not really sustainable quality parts Printrbot… 