Ironing looks great, but my corners look terrible!

Bambu Lab P1 Series Troubleshooting
1

Hi all,

I wondered if anyone can help. I’m printing a fairly big flat piece and I cannot get consistent ironing across the piece. I’ve printed this on two different P1S now and get the same problem. The corners have a bubbling (please see pics) and completely ruin the aesthetic, while the rest of the piece looks perfect. I downloaded an ironing test and chose what looked like the best results for my settings. Can anyone point me in the right direction of what the issue might be? Thanks! My settings:

  • Printers: P1S
  • Slicer settings: 0.12 Fine
  • Ironing: Top Surfaces/Rectilinear/Ironing Speed 40/Ironing flow 40/Ironing line spacing 0.15.
  • Filament: Bambu Lab Grey Blue

Many thanks!

IMG_4107
IMG_41071920×2560 858 KB

IMG_4108
IMG_41081920×2560 870 KB

IMG_4109
IMG_41091920×2560 775 KB

IMG_4110
IMG_41101920×1440 258 KB

IMG_4111
IMG_41111920×1440 308 KB

IMG_4112
IMG_41121920×1440 431 KB

2

The ironing is the same as this

image
image712×534 89.9 KB

You move material from one place to another with the nozzle.
Where the ironing start, it looks nice, but not where the ironing end.

I find it consume a lot of time but not produce satisfactory result.

2 Likes
3

Could the object have lifted off the build plate in the corners due to shrinking and warping? If it didn’t (and you’re sure it was stuck down well), is it possible the build plate corners lifted off the magnetic bed?

A troubleshooting step might be to iron some smaller (say 50cm) test objects of similar construction in each of the build plate’s corners to see what the result will be. If you get good ironing, then it could point to a heat related warping problem with the single large object.

4

Possilby under extrusion on this parts? Then here would not be enough material to iron it out

5

Many thanks. I’ll try that experiment. I’ve certainly printed smaller items and they’ve come out good, but not in the build plate corners so I’ll check that. Thanks!

6

So do you find that it is not possible to get good ironing at all on large flat surfaces? Thanks.

7

Thanks. I guess if I printed it without ironing I could then work out if it was under extruding in the first place. I’ll give that a try thanks.

8

It’s possible, but usually need tweaking for each different cases.

image
image640×640 53.7 KB

Just like how worker smooths out concrete surface, It should be one continuous movement for the best result. If the movement was disrupted and nozzle had to lift up then go back and forth, there is high change you will have artifact on the top surface.

Anyhow, ironing flow default is 10%, let say you have done flow calibration that make the top surface 100% perfect, no overextrusion nor underextrusion. Then 10% flow added to the top surface has to go somewhere yes? Now you see the problem.

If I have to do ironing, I would do underextrusion by 8%, say flow ratio of 0.87 (calibrated flow would be 0.95). Then add 10% flow from ironing on top of that make it overextruded by 2%. Well, I say 2% overextruded is better than 10% overextruded. Just a suggestion, I just make up the number so it might not work for you.

1 Like
9

Thanks very much for the explanation. That makes a lot of sense. I’m going to experiment with that, as you say and hopefully work out a setting that gets that balance right. Many thanks again!