So I figured out why I’m getting my Y axis issues. It’s clear to tell in the video.
It appears on the left side screw you’re missing some kind of bearing/bushing sleeve at the top that would keep it from moving off center and thus wobbling!!!
@Fook_INGSOC actually the threaded rod is bent. The other side is setup the same way and and doesn’t have this issue. The smooth rods locate Everything but because the one side is bent so bad, it still pushes it out of wack. I’m going to try and bend it back but if I can’t get it right, I’ll send this video to the person I bought it from and ask for a replacement. Worse case scenario, I’ll buy my own rod and modify it to fit. All the benefits of buying a cheap printer. Lol. Like I’ve said a bunch of times, I’ve got a big jar of polish for this turd. It’s slowly but surely getting better. $154 for the printer. $16 for the cable management. $5 for a blower fan. Total cost so far, $175. Once I fix this rod, it should be pretty good. I’ll probably still replace the front support at some point but I’ll just make one at work for free with some scrap.
Looks pretty much the same on mine. Don’t bother bending them back or replacing them with similar ones - they’ll quickly bend again. Constraining the lead screws with bearings on the top will make it even worse. The plywood frame is the main problem. Btw. that’s the z axis. 
@Martin_Klein well it was bent when I got it, I just didn’t realize it was causing a problem. And yes, I know that’s the Z axis. My problem was that I was having issues in the Y axis. I just didn’t realize that the issue stemmed from a Z axis issue.
I had the same type of wobble on my left Z axis threaded rod. In my case the problem was the brass threaded nut was off-center inside the Z plastic slider… caused wobble and stiff operation. I just loosened the 3 screws on the brass nut…allowed the nut to center itself until it operated smoothly and then fastened with glue instead of tightening the screws.
@Richard_Karlson good idea! Will have to check mine for this.
Always ALWAYS always roll your bars… You might not be able to do anything about it right away, but at least you will know there is an underlying issue there.
The threaded rod used in the CTC is standard, you can pick them up anywhere. Roll it on a flat surface before taking it to the till, though… It might look fine…but
Were you getting wobble in just Y or also X?
that’s why TR8 is awesome. It’s cheap and I’ve never had one that’s caused any z wobble.
The Z rods are supposed to float like that. If you don’t let them float and overconstrain them your problem will actually get worse. Allowing them to float lets the Z axis linear rails provide the positioning.
Edit: Ahhhh, I see what’s happening – the nuts are wobbling. Okay, Yes, THAT is causing your issue. Your X stage should have more linear bearings on either end and you need to loosen up the nuts so they aren’t forcing the X stage around like that.
I don’t understand why people go with ACME threaded rod and then overconstrain the nuts like this…just 6mm allthread is perfectly okay.
@ThantiK sometimes the thinner rods come bent. Having thick rods solves this but like you said overconstraining causes a lot of issues.
I would switch to TR8 and solid couplers. Should fix your issue. I fought z banding on one of my printers for over a year. I replaced them multiple times with new and seemingly straight ones, but it took the TR8 to solve the issue completely.
@Kevin_Danger_Powers on my cheap prusa i3 i made the following changes:
Anti z-wobble…https://www.thingiverse.com/thing:1858459
–> z can wobble but is not anymore connected to x
Self centering z-coupler…https://www.thingiverse.com/thing:1651349
–> works perfect - easier installation
Z-Axis anti backlash…https://www.thingiverse.com/thing:694575
–> helped much for z-changes (z-hops during retract, layer change…)
maybe you want try…
@Karl_Schlacher I will look into these, thanks!
@Griffin_Paquette tr8 huh? I’ll have to look into these. What’s so special about them?
@ThantiK yeah I figured they were supposed to float because they wouldn’t be perfectly straight. I’ll try and make sure they can float around best I can.