#Possible Z Wobble? Inconsistent Layers

15 messages · Page 1 of 1 (latest)

limpid wigeon Dec 6, 2022, 4:27 AM

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Printing brand new RR PETG at 255°C on 3.1 500
Acceleration: 6k mm² /s
Perimeter Speed: 175mm/s
Hotend: Rapido UHF
Nozzle: CHT Volcano 0.4mm
Extruder: LGX lite
EM: 0.95
E Steps are spot on (last I checked 2 months ago)
Layer Height: 0.2mm
3 perimeters

Here are some photos. Looks consistent across all the layers.. which makes me believe it’s something to do with my Z axis.. but not quite sure what to check first.

I took a photo of a calibration cube I printed immediately before this print. Which looks pretty good minus a little over extrusion on the top layer.

oak niche Dec 6, 2022, 7:42 AM

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limpid wigeon Printing brand new RR PETG at 255°C on 3.1 500 Acceleration: 6k mm² /s Perimeter...

One thing you could try right out of the box is PID Tuning your bed (and extruder).

limpid wigeon Dec 6, 2022, 8:22 AM

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That was one of the first things I did after I built it. Anytime I change anything major I redo it just to make sure

oak niche Dec 6, 2022, 8:30 AM

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ok, check maybe your grubscrews?

vestal ridge Dec 6, 2022, 11:05 AM

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More likely over extrusion and cooling related

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Z wobble is a repeating pattern matching the lead screw (4mm), which this isn't.

limpid wigeon Dec 6, 2022, 4:38 PM

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Ok what’s considered “too low” EM should I just print a tall cylinder and change the EM until the lines are gone?

limpid wigeon Dec 6, 2022, 5:31 PM

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vestal ridge Z wobble is a repeating pattern matching the lead screw (4mm), which this isn't.

Ok this is crazy. I printed this tower that changed EM from .8-1.03 I thought the results would be more noticeable…

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Could it have something to do with the bed mesh..? Maybe it’s over compensating and squishing the layers?

vestal ridge Dec 6, 2022, 5:35 PM

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limpid wigeon Ok this is crazy. I printed this tower that changed EM from .8-1.03 I thought th...

this looks fine to me for the last many sections?

limpid wigeon Dec 6, 2022, 5:36 PM

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vestal ridge this looks fine to me for the last many sections?

Haha but I couldn’t repeat the problem.. the last layers are 1.0 and 1.03 em.. the print I originally posted was printed at 0.92.

vestal ridge Dec 6, 2022, 5:37 PM

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limpid wigeon Haha but I couldn’t repeat the problem.. the last layers are 1.0 and 1.03 em.. t...

oh well 😂

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Are you printing enclosed?

limpid wigeon Dec 6, 2022, 5:41 PM

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No

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Maybe I try the same tower but several of them around the build plate?