thanks everyone and @neotko for the great ideas to check. here's where i am today.
1. The print head bearings are fine and snug, no tack tack there.
2. The slight Y block movements in my video is in the "normal range" when compared to the UMO+s I have at work that do not exhibit the issue.
So I think today I'm going to try to focus on my extruder assembly. I think I'm going to try to see if there is a relationship between the slow speeds and teeth marks on the filament and maybe see if I can correlate rotations on the hobbed bolt or wood gear to extrusion differences.
I suppose I could try swapping the entire extruder assemblies with a functioning machine, but that seem like a bunch-o-work so I'll start with more test prints and measurements before resorting to that.
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neotko 1,417
Oh about if that's the issue. It might be. I had them replaced by warranty but I also moved to misumi shafts.
Check my posts about how to check them etc. the best way imo it's using high tech flat stuff or by setting the shafts between two bearings and... Well read the posts it's a long story.
https://ultimaker.com/en/community/16964-umo-woobling-x-block-sometimes-y?page=last#reply-115820
Aftet this I moved to gt2 and misumi shafts.
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