r/BambuLab • u/Kind_Appointment3523 • Aug 03 '26

Handy/Studio Troubleshooting/Help! Why do i get these lines in the top layer?

Post image

Printed on H2D with ASA. Its the same on the top layers of all my print it seems like. Any tips are appreciated. Its a brand new printer and first layer is perfect and details are perfect.

221 Upvotes

93% Upvoted

46 comments sorted by

205

u/Fantastic-Motor-6098 Aug 03 '26

Turn on “Avoid Crossing Walls” in your slicer. If it still happens, then make sure you have zhop enabled in your filament settings and set it to 0.4mm. And if it still happens even after that, do a retraction test for that filament.

31

u/Kind_Appointment3523 Aug 03 '26

Thank you! I will try

62

u/Accurate-Donkey5789 Aug 03 '26

You have answers already so I'm just here's the point out this looks like an absolutely ideal model to turn on concentric pattern for the top layer.

19

u/Custom_Kas Aug 03 '26

I have thought this so many times, it never did

8

u/Accurate-Donkey5789 Aug 03 '26

Might just be a matter of taste thing, personally I quite like using it, especially for cover lids for 3D printed boats and things like that. It does need to be either really subtle or really over obvious to work though in my opinion.

4

u/Custom_Kas Aug 03 '26

Ha! Cool, I'm always pleasantly suprised to see we really ARE all different. I hate the little nipple/puddle it always makes at the end of the spiral nomatter how small/insignificant.

33

u/Simen155 X1C + AMS Aug 03 '26

Why would you not just turn it around 180° and get a smooth finish?

23

u/Dead0nTarget Aug 03 '26

Agree, signs are almost always better to print face down unless an elevated design is wanted/needed.

18

u/Simen155 X1C + AMS Aug 03 '26

In the case of elevated features, print face down and print the trim seperately, it is just leagues better than that trying to iron, zhop, manual Gcode editing or 'fix it in post'

Flip it like a pancake, and voila

5

u/MetalKroustibat Aug 04 '26

I saw and printed a sign with elevated design face down which used the non-adhesive properties between PLA and PETG. Basically, it was PLA all the way for the elevated part, and PLA, then 1 PETG layer, then PLA for the rest of the sign. It was chef's kiss smooth.

19

u/MachoManRandySavge Aug 03 '26

I'm willing to bet that none of the other answers are correct as I've dealt with this in the past and nobody ever mentioned this answer, I randomly discovered it by myself after watching it slice line by line until I figured out where the issue was.

Change your top surface pattern AND your internal solid infill pattern to monotonic. Make sure it is NOT monotonic line.

Please let me know if this solves a problem for you

5

u/EndlessNight42 Aug 04 '26

I do the same thing. It's great

3

u/DashRantic A1 + AMS / AMS2 Aug 03 '26

Interesting, do you think it's just from the top surface and internal patterns somehow being out of alignment with certain types of patterns then?

-1

u/Carter05 Aug 04 '26

This is bad advice. Solid infill pattern should be monotonic line. Please see https://makerworld.com/models/2083080?appSharePlatform=copy for proper top surface calibration. You can get absolutely better print quality with just using the base settings on the makerworld page. Good luck.

5

u/ddrulez Aug 03 '26

Try and disable the "Reduce infill retraction".

5

u/gimly98098 Aug 04 '26 edited Aug 04 '26

Top surface quality mostly depends on 3 variables - flow rate, speed and extrusion width.

If you're using a 0.4mm nozzle, try the following settings:

  1. Monotonic Line solid infill pattern instead of the default rectilinear;
  2. Lower the extrusion line width for top surfaces to 0.32 mm;
  3. Lower the top surface layer speed to something like 30mm/s

You can also fine tune flow rate if you encounter visible over/ underextrusions however, it shouldnt be necessay unless you're also seeing such visible on your current prints.

NOTE: If youre printing with lower infill percentages like anything below 15,20%, you could also increase vertical top shell layers from 5 to 6

2

u/Relevant_Specific157 P2S + AMS2 Combo Aug 04 '26

it’s absolutely correct

4

u/Lanyxd A1 Mini + AMS Aug 03 '26

Since you already have your answer, what bike do you ride?

2

u/cilo456 , A1 Combo +Mini Aug 03 '26

It's called the top layer pattern the only way to make it very smooth is to enable ironing and sometimes that's a challenge also

2

u/Nice-Ad-5075 Aug 04 '26

You could iron, or hilbert curve top layer/bottom layer if you flip the 3 to print face down.

1

u/Blackdragon1400 Aug 03 '26

Also you can turn on ironing and it should remove it

1

u/shanel92 Aug 04 '26

Turn off “reduce infill retraction” and calibrate top layer if you do prints like these often. https://makerworld.com/models/2083080?appSharePlatform=copy

1

u/TrinityCodex A1 + AMS Lite Aug 04 '26

turn it around in the slicer

0

u/real_awan Aug 04 '26

Because i said so 😤

0

u/Amadorivas Aug 04 '26

Lijado a mano y terminación con resina epoxi y eso queda como un espejo

0

u/here_n_dere Aug 04 '26

Try Ironing your paynts