Possible Z Wobble? Inconsistent Layers
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.
![No description](https://cdn.answeroverflow.com/1049542592171352064/55BD0062-C36D-4C99-B601-809A18FD4D79.jpg)
![No description](https://cdn.answeroverflow.com/1049542592745979914/C0B96E43-2FB0-4E3A-BB69-332E0462E0C1.jpg)
![No description](https://cdn.answeroverflow.com/1049542593417072681/3B6C8235-071A-4B1B-B118-A435A331F2B9.jpg)
11 Replies
harsh-harlequin•2y ago
One thing you could try right out of the box is PID Tuning your bed (and extruder).
inland-turquoise•2y ago
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
harsh-harlequin•2y ago
ok, check maybe your grubscrews?
More likely over extrusion and cooling related
Z wobble is a repeating pattern matching the lead screw (4mm), which this isn't.
inland-turquoise•2y ago
Ok what’s considered “too low” EM should I just print a tall cylinder and change the EM until the lines are gone?
inland-turquoise•2y ago
Ok this is crazy. I printed this tower that changed EM from .8-1.03 I thought the results would be more noticeable…
![No description](https://cdn.answeroverflow.com/1049739863164993556/CB5EBE6C-BC3E-4A0E-9B5E-046076C1C057.jpg)
![No description](https://cdn.answeroverflow.com/1049739863676702740/6891FE17-E77F-4FEB-B1EC-385ACF12045E.jpg)
![No description](https://cdn.answeroverflow.com/1049739864230338631/A757ED4C-7D50-4A75-AAD7-4B532C58FCCA.jpg)
inland-turquoise•2y ago
Could it have something to do with the bed mesh..? Maybe it’s over compensating and squishing the layers?
this looks fine to me for the last many sections?
inland-turquoise•2y ago
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.
oh well 😂
Are you printing enclosed?
inland-turquoise•2y ago
No
Maybe I try the same tower but several of them around the build plate?
I think I figured out the problem. It loaded the wrong bed mesh. The prints look better but I still have other issues I will create a new post for.