Layer drift between models
This model prints alongside another model on the same bed. Layer height is .15.
Both models seem to suffer from layer inconsistencies throughout the area where the models are under the same Z height.
To restate, where the two models share Z movements, they seem to suffer inconsistent X or Y movements (not sure which) that result in undesirable visible layer lines on one of 3 printers.
Quality seems to improve once the shorter model (not shown) is finished, just above the blaster scar on this model.
Turning the model vertically actually makes things worse. Another related print has a vertical part which looks very inconsistent.
The issue does not seem to be in the gcode because 2/3 MK3/S printers print it beautifully.
I know I could print the model alone, but for operational reasons, I need these models to print together.
I've checked extender gear alignment, changed filament brands, verified that the bed is stable and that the extruder is stable on the X axis. I went back through the calibration wizard. First layer adhesion is great.
The printer is about a year old and sees about 20h use daily.
I’m looking for your top three targets for what to try.
RE: Layer drift between models
For any kind of layer issues, I suggest checking both the X and Y bearings and tension. Z is less likely to cause an issue, unless you cross thread the Delrin nut like I did.
If you move the carriage in either direction, it should be smooth. Any binding, try loosening the mounts slightly.
Make sure you have good lubrication on all axes.
RE: Layer drift between models
What is the process for checking a year old bearing? Belt tension seems good, between the other printers that are producing accurate prints.
One more oddity - the inaccuracy is fairly consistent between prints. Print 1 and print 2 and print 3 all seem to zig and zag in pretty much the same way.