Hello,
I have a home made PrintrBot ( Original ), no heated bed, standard slic3r settings, 0.3 layer hights, plastic pulleys with t5 timming belts, my z rod is kind of bend ( has a small wobble to it ).
The first layers are of the rest are still of but less. I've mess around with the motor controler voltage, the belts but nothing. I will try to replace the z rods but i don't thing is all in the z rods.
Thanks.