So thanks @Stephanie_A and the other people,in this group for the advice. I simply loosed the bolts clamping the z-rods to the bearings, and most of the z-wobble is gone. Any suggestions now?
You’re under extruding by a lot. May want to tune that.
Much better!
What slicer are you using?
Way better. Glad you solved that issue. Next step might be to calibrate your filament. That will help with the stringy under-extruded look.
+I have been using Autodesk Print Studio, but this was sliced with Slic3r. Is that underextrusion? I calibrated the flow for ABS, and this is PLA, will that make a difference? I’ll tell you tonight when I find out! 
Thanks!
On one hand PLA and ABS are different plastic types, on the other, I’ve never had to adjust my extrusion flow rate because of that. Did you calibrate your extruder with the hot end off & removed, so that you’ve measured that it pushes 100mm on a 100mm extrusion command? Do you have any top layers being built there?
@Aaron_Spaulding Depends on what you are calibrating to. Different filaments and even different colors of the same material will calibrate differently. For precision print results you have to calibrate for the thermal expansion and contraction properties as well as the dimensional properties when it melts and cools.
I use these calibration clips found here to calibrate all my filament spools: http://www.thingiverse.com/thing:1037301
Follow the instructions. Using this calibration technique I can use different rolls of filament on different machines and have my assemblies go together perfectly.
@Jeff_Parish , Ok, and Thanks!