Oldham couplers, if you're reading this, it wasn't your fault. It was mine. I didn't understand you. You were perfect. Will you ever forgive me?
So while deeply lost in thought about completely redesigning the gantry for the GO v.1 and agonizing over what kind of couplers really are best for my bot, a helpful chap on Google+ (+Joe Spanier) said, "Oldham couplers HAVE to have thrust bearings... to work correctly."
Of course this makes sense. Oldham couplers are only designed to transmit Read more [...] printrbot GO – i take back all the nasty things i said about Oldham couplers
Oldham couplers, if you're reading this, it wasn't your fault. It was mine. I didn't understand you. You were perfect. Will you ever forgive me?
So while deeply lost in thought about completely redesigning the gantry for the GO v.1 and agonizing over what kind of couplers really are best for my bot, a helpful chap on Google+ (+Joe Spanier) said, "Oldham couplers HAVE to have thrust bearings... to work correctly."
Of course this makes sense. Oldham couplers are only designed to transmit Read more [...] 
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 
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