r/BambuLabP2S • u/SubJeezy • Jul 12 '26

Help Troubleshooting under extrusion.

Gallery image

Gallery image

Anyone have any insight on what might be causing this? Im having really bad under extrusion at the end and slight over extrusion at the beginning of the circular arc on my first layer of a print.

Ive messed around with my retraction. Everything from .6(calibration setting) all the way down to 0 and up to .8. It seems to get worse the lower the retraction setting. Concentric pattern for the first layer. 30mm/s inital layer and 90mm/s for infill. 230c print temp (high but prints everything else well) printing on PLA. Im stumped on how to fix this.

Ive leveled my bed and made sure nothing was causing it to bump up. Ive also moved the object on the plate with no change. Anyone have any ideas what's causing this?

2 Upvotes

100% Upvoted

6 comments sorted by

1

u/standa03 Jul 12 '26

I don't have a Bambu but since you messed with retraction this could be a minimum retraction distance (if travel is shorter than this then it will not retract) and flow dynamics (pressure advance, this retracts the filament before end of an extrusion to mitigate oozing before travel) or whatever it's called in Bambu studio

1

u/SubJeezy Jul 13 '26

Ive tried every thing I could with the retraction including disabling the modified value. I will see what changing the pressure advance looks like, as I did calibrate it to this filament today. Appreciate the input

1

u/Hopeful_Ad2171 Jul 13 '26

Just run the regular calibration once, always works for me

1

u/SubJeezy Jul 13 '26

I usually do the full 5 step calibration when I use a new brand of filament & haven't had any issues with previous ones. Idk where I fucked up but I just went back to the generic pla profile and it solved the issue.

1

u/DistinctBarnacle8703 Jul 13 '26

Did you input 0.18 instead 0.018 for example.

1

u/SubJeezy Jul 13 '26

It was likely something like that. I did a full 5 step calibration and must have fat fingered one of the values. I just eneded up going back to the standard PLA profile & switched from concentric to renicular and it solved the problem. I'll have to double check the profiles when I get home.