Ok, it's time to man up and say I was wrong. Soo wrong.
The intial test prints after installing my cheapie Oldham couplers were glorious. They represented such a dramatic improvement over my previous prints as far as Z wobble goes that I was convinced that I'd found the be-all-end-all solution for Z wobble. I'd been using them for about a week when I started to notice some strange Z artifacts creeping back into my prints however. The layers were shifting along the Y axis as before, but Read more [...] printrbot GO – i take back all the nice things i said about Oldham couplers
Ok, it's time to man up and say I was wrong. Soo wrong.
The intial test prints after installing my cheapie Oldham couplers were glorious. They represented such a dramatic improvement over my previous prints as far as Z wobble goes that I was convinced that I'd found the be-all-end-all solution for Z wobble. I'd been using them for about a week when I started to notice some strange Z artifacts creeping back into my prints however. The layers were shifting along the Y axis as before, but Read more [...] 
First, a disclaimer: I'm going to talk a lot about something that I will mostly call Z wobble in this post. I know there are folks in the RepRap community with strong ideas about what Z wobble really means as opposed to Z ribbing or various other artifacts and anomalies found on the vertical sides of printed walls, so please forgive me if I'm using the language incorrectly. What I will be talking about is the side to side shifting of layers caused (at least in part) by the threaded rods pushing