I’ve been having this issue and can’t get any straight answers. Using ASA but I’ve tried other filaments. Any time there is a “segment” I get bad layer lines at whatever thickness the segment is. The pictures should explain better. This is on numerous parts and I’ve tried every setting possible. Hopefully it’s not a mechanical issue but I’m about to give up on this P1S and go with something else.
P1S
Polymaker ASA, ive tried other filaments and same issue.
test model file attached.
Welcome to club!
These issues are troubling Bambu users since day one and it seems there still is no 100% working fix available.
Long story short:
Layer times, pressure changes, acceleration, k-factor and more come together here.
If you want much better results just do what we did in the old day and print with 40-60mm/s max
Ok, bad jokes aside…
You can mitigate some of the problems you have, like with a spot on filament calibration, tweaking the speeds and settings,…
Really comes down to finding the best balance between possible quality and possible speed(s).
Sadly having a fast printer does not always mean prints come out as expected.
Thanks for the reply. I’ve tried the same model with probably 6 different types of filaments. Mostly bambu filaments but the others I did full calibration. I read up on some other threads as well and it seems like this is par for the course with this printer. I’m open to try other troubleshooting but it’s pretty disappointing.
The first and second image I can’t really comment much on. The first image looks almost like a layer shift, and I have no idea about the second image.
The third image however is normal. What you’re seeing in the third image is the result of differences in speed and/or layer time. Essentially, the longer it takes for a layer to be printed, the longer that same layer has time to cool before it’s re-exposed to heat when the next layer gets printed. Layer time can be influenced by speed changes but also geometry changes where a laid layer is bigger or smaller than the previous one. Different amounts of cooling can create different finishes on the surface of the print.
This is exactly how the technology works. What you’re seeing is the lines that occur as a result of the material density changing between one part of your model and another. You’ll note that the lines coincide with the floor feature in the model. It is at that point that the filament density changes. It influences the contraction of the filament and therefore changes the outside edge appearance.
There are a number of things that can be done but I will focus on the two most effective.
Change the wall order from the default of inner/outer to outer/inner which will give the walls more time to firm up before the next pass.
Increase wall loops.
You can also tune your filament better. I see evidence of filament tuning issues. Another option is to make greater speed changes. Right now you have outer walls set to 4,000 from the default of 5,000. Go bolder and change it to 400 just to see if it influences the result. Then add speed until you start to see lines again and then back off the speed.
Also, you’re using Bambu silk. The factory defaults are wrong, trust me. Try backing off on the max flow rate or as I stated above, calibrate your filament.
I really appreciate the quality responses. @Olias, I’ve made the changes you recommended and I’ll do another print. I’m actually using ASA, it must have defaulted to the silk for some reason. I’ll report back with the results. Thanks again
I’ve done three full prints with these settings and the lines are virtually gone. I really appreciate your help. Ordered another P1S today to keep up with demand.
