Hi all,
I’m having a weird problem with my brand new Bambu P1S. Layer adhesion is extremly bad… with PLA.
I can’t figure things out. I also have an X1C and with the same spool of material and the same slicer settings i have a perfect result. But as soon as i try to print on my P1S layers wont stick together and the part is very fragile.
You will find some pictures attached : wall, layers and infill doesn’t stick properly.
I tried the following :
Calibrate material flow, the material is black Ingeo 3D870 PLA. Result gave me 1.02 instead of 0.98 on my X1C.
Increase temperature from 220 to 230°C
Reduce cooling from 100 to 70%
Volumetric speed is at a default 18mm^3/s
None of this work. I’m a bit stuck, do you have any idea on how to solve this problem ? Is it a known issue ?
Most of the layer adhesion issues I had, were solved by thoroughly cleaning the pei sheet with dish soap. Roughly scrubbing it with a sponge for 2-4mins, then rinsing with water does the job for me.
If that does not work, you might have to level your bed with the knobs under it. There is a bed leveling guide made by Bambulab.
First, thanks for posting clear and concise images and remedies you’ve tried. This is an example of a quality post that can be more easily addressed rather than guessing.
A couple of things that I see in the image and some diagnostic suggestions.
Have you tried something simple like rotating the model on the build plate 90 or 180 degrees. If as you appear to suspect, f the warping is being influenced by uneven cooling, changing the orientation might prove or disprove this theory.
Have you tried to increase the nozzle temp to a more extreme temp i.e. 60c? Not that I would expect this to fix the issue but it would at least allow one to rule out a nozzle temp issue. If the resulting output show less separation, I might pursue investigating the thermistor, perhaps it’s a poorly seated connector or desiccated thermal grease on the thermistor/nozzle clip.
Have you disable the aux fan completely simply to rule it out?
Have you tried printing in quiet mode(50% speed).
Have you tried cutting the model’s offending section, then creating clones of the offending section so that you have multiple test samples? If you can refine your test area to the most trouble-prone section of the model and isolate it, you can then more speedily diagnose the problem by running multiple tests.
Take each model section under test and change the speed under “objects” to see if speed influences the layer adhesion. If it is temp related this will help prove that.
Change the layer height for different objects to see it’s impact on adhesion
Do you leave the door/lid open on your printer? If yes, do the opposite to see if it has an affect.
If you don’t already have one. Have you added a temp/humidity sensor to measure the difference of the chamber of your X1 and P1? That will give you more data.
Hi,
Thank you for your detailed feedback.
I’ll answer point by point.
The photo you see here is my latest try with reduced cooling and higher nozzle temp. I had other tries with no warping (mostly with default settings ). I’ll do a test cylinder to explore your idea.
I’ll do that with a test cylinder and upload the results. Faulty thermistor could be a good idea.
I didn’t disabled it completely. I can try.
No, but i tried slower wall speeds.
Layer adhesion is bad on tyhe whole model. 2mm thick shell all arround. I’ll work with a test cylinder with a 2mm wall to do a sample part.
5-2) Door and lid were closed, same as my X1. My X1 is in the same room, and both printer are on the same table. Environement is the same, material is the same, part is the same, result is different.
Update : Increasing the temperature to 280°C seems to give good results (like said on you point 2). I’ll investigate the thermistor.
Update 2 : Inspecting the hotend show dry grease. I changed the thermal paste and reasembled the whole thing (see pictures)
Update 3 : After thermal paste change sample parts are OK at reasonable extrusion temp (220deg). But they are great at 230-240°C (which is still high for a PLA) I’ll try the whole initial part.
Update 4 : Problem seems to be solved. It was due to dried thermal grease. Kind of bad for a brand new printer
Thanks a lot @Olias for putting me in the right path !
