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.
11 Replies
extended-salmon•3y ago
One thing you could try right out of the box is PID Tuning your bed (and extruder).
afraid-scarletOP•3y 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
extended-salmon•3y 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.
afraid-scarletOP•3y ago
Ok what’s considered “too low” EM should I just print a tall cylinder and change the EM until the lines are gone?
afraid-scarletOP•3y ago
Ok this is crazy. I printed this tower that changed EM from .8-1.03 I thought the results would be more noticeable…
afraid-scarletOP•3y 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?
afraid-scarletOP•3y 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?
afraid-scarletOP•3y 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.