The issue with my Elegoo Ultra 16K is back, and I have tracked down to Z-axis judder (i.e. stepper motor skipping), which seemed to happen every time it changes direction.

Stripped down and greased and run up/down hundreds of times, and seems to maybe have cleared.

Now for a test print

[test print looks ok]

#elegoo #3d

@revk Oh foolish foolish man. Test print(s) will be perfect, it'll be the critical prod one you calculated you had *just* enough stock remaining for that'll go wrong.
@Elwell @revk maybe he is a Printer Whisperer, and has started the critical print with a loud cry of "well this is just a *test* print, obviously..."