I have created a model myself in Fusion 360 for my P1S printer. On the outer walls, there are random bumps in the layers. It looks like the layer is moved a bit on the Y axis. These bumps are completely random.
I believe this might be related to the spherical nature of my print, and I’m unsure about the proper setup for such geometries.
I’ve tried different prints with the same filament, and they all turned out fine.
My Setup
Printer: P1S with AMS
Filament: PETG (also tried PLA with same results)
Preset: 0.08mm High Quality BBL X1C
Modified Settings (Latest Attempt)
Ironing enabled
Infill: Adaptive cubic
Top surface pattern: Concentric
Outer wall: 40 mm/s
Inner wall: 100 mm/s
Support: Standard
Sparse infill: Adaptive cubic
Troubleshooting Steps Taken
Changed outer/inner walls settings - no improvement
Reduced speed for outer walls - no improvement
Tried variable layer height - no improvement
Exported to STEP instead of STL - no improvement
Cleaned Z-axis screws multiple times using different tools and added new lubricant - no improvement
Printed a Z-wobble test tower which looks good
Printed a calibration cube which looks perfect
Performed various calibrations - no improvement
Since other models print correctly, I suspect there must be something specific about my model or slicer settings that’s causing the issue.
These layer deviations are generally caused by improper tool head travel or obstructions in your filament feed. You didn’t mention whether you are using an AMS, but the first troubleshooting step would be to try reproducing this shape using a direct spool without the AMS. If the problem goes away, then something in your AMS feed is obstructing smooth flow. Go to the wiki for diagnostic steps and inspect your PTFE feed tubes for alignment and binding. This issue can also be caused if your PTFE tube is snagging on something during the print, so check that too.
The fact that the ridges appear uniform across the X-Y travel but non-uniform between layers could be due to dirty carbon rods or improperly lubricated Z-screws. To rule this out, follow the P1 maintenance procedure in the wiki.
Based on your forum join date, it looks like you may have only recently received this printer. Maintenance shouldn’t be needed yet, but you would be the second person this week to report this issue, making me wonder if the factory is not properly lubricating the Z-axis rods. DO NOT lubricate the carbon rods—it will ruin them! Follow the wiki: Bambu Lab P1 series printer Maintenance Recommendation | Bambu Lab Wiki
Another factor could be belt tensioning, but unless you are skilled at this, you are more likely to make it worse. There is a procedure in the wiki that walks you through it, but this should be a last resort. I would investigate feed problems first.
I recommend the following basic diagnostic steps to confirm printer function and then upload photos to this thread so we can help you further.
Right-click and select a cube primitive. Do this twice because one of the cubes should be rotated 45 degrees. This will highlight any problems with carbon rods, stepper motors, and belt feeds. I won’t go into why unless you’re interested. Here’s how to do it: Remember to move the first object out of the way, as you might think the second object didn’t work when in fact it’s overlaying the first model.
Here’s a tip. You’ve got really good light already on the sample blue object you posted so you’ve mastered that. However, adding addition angles to share with us will help us help you. One additional trick I might suggest is that you will find that get much better images for us to diagnose if you hold the camera further away and use the zoom function rather than trying to hold the camera close and having the autofocus fight with you.
Here’s an example of what I mean by the kind of clarity that will help us see greater details. Click on the images to zoom and you’ll get the idea. Also, throw something familiar in the image for to show scale, a pencil or a coin works great.
