Help! Issues with Z axis after swapping a part on prusa style machine

http://ift.tt/2jI22Hu I had this printer running well for the last 6 months or so when the left X axis tensioner plastic broke. I went ahead and printed a replacement and had to disassemble the left z axis to be able to swap the part. When replaced now every couple layers it seems like i get a gap out the outside (see picture). Any ideas on what could cause this? Is it z wobble? Before I go about troubleshooting I figured I would see what you guys thought. Thanks in advance! http://ift.tt/2ik8EGF