One of the machines in cluster had loose fasteners on the bed plate which was probably what was causing that machine to skip steps on the y axis.
@kent I inspected 3 of the hibiscus machines in cluster. @EricNugent mentioned he had seen the majority of these issues before they even ran any of them, however they have been informed not to work on these machines.
L3: z and x belts looser than they should be, the toolhead's thermistor was messed up causing thermal runaways (@west fixed it) and as you mentioned all the fasteners on the y plate were loose. I ran a print overnight and it still shows some resonance. The x carriage bushings have excessive slop which is likely the cause for the resonance. We are going to tighten up all bushing parts and plan on using some oil to install bushings so the o rings don't get messed up.
L5: x and z belts were a bit loose. x carriage a bit sloppy
L6: the toolheads 5V heatsink fan was not running and it got clogged with ABS (@west fixed this also). All belts x y and z were pretty loose. And the y plate fasteners were a bit loose on this machine as well however not as bad as L3. This machine was missing the x belt tensioner post and also has a pretty sloppy x carriage as well.
Another thing is @west noticed that all these toolheads have an outdated blower shroud. There is a new revision that improves bridging so that there aren't stringers affecting the airflow.
I installed the driver cooling shroud on L3 and kicked off another print. It is still throwing some driver overtemp warnings, so we will need to try a different design or something to cool the drivers better, especially for cluster
@tutley As far as the blower shrouds are concerned, at the time those machines were moved to cluster we were not aware of the change made to the blower shroud nearly a month prior, nor had cluster been aware of them to begin printing them.
We need to resolve T1543 before we rework those tool heads so we don't have to rework them for another change.