Not able to get a clean first layer on the H2D. Any ideas?

Bambu Lab H2D
1

Hi,

i am out of ideas. My Problem is, that my H2D is not able to create a clean first layer. The top is always rough in certain areas.

When i received it, i did a full calibration and i also cleaned the plate very well. My Filament (Bambu PLA Basic) is dryed.

I started the first layer test where the left nozzle is printing the largest area and the right nozzle a smaller one (this model: H2D Full Bed Test by SIMUVERSE.AUMakerWorld: Download Free 3D Models).

The part that the left nozzle printed was mostly clean. There was only a small area where the surface was rough.

nozzle_left
nozzle_left360Ă—640 67.7 KB

when the right nozzle started, the situation was different. the whole area had a rough surface.

nozzle_right
nozzle_right360Ă—640 56 KB

I cleaned the plate again und tried with a different PLA on the right side. The result was the same. (the bottom surface looked good and the adhesion was also good).

Bed leveling was set to on instead of auto btw.

I then did what was mentioned in the wiki: H2D First-Layer Printing Optimization Guide | Bambu Lab Wiki

I removed both nozzles, checked all screws and i loosened the front screws of the bed. Afterwards i did another calibration and started the print again.

The result was even worse. Now also the left nozzle created a rough surface on larger areas. I am also able to hear a “scratching” sound when the nozzle hits the affected area on the far left.

after_wiki
after_wiki360Ă—640 65.7 KB

I am out of ideas what to do (ticket is already created). Btw. i also tried the other side of the plate with the same result.

When i am doing the same thing with my P1S the first layer looks flawless.

Has anyone any idea what else i could do?

BR
Sebastian

2

Start by calibrating the flow rate and observe the results. Identify the smooth top layer, then run the second flow rate test to see if you can achieve better results

Next run the flow dynamics get the K value and save it for that filament.

  • Dialing in the flow rate will improve quality.

  • If needed, you can adjust the initial layer flow ratio, but this setting is only accessible in Developer Mode you will have to turn it on in preferences.

  • In some situations, it may also be necessary to fine-tune the Z-offset based on the filament you’re using.

  • Top layer with most filaments, set the top surface line width to 0.35 mm and the top surface speed to 100 mm/s for both nozzles. This will enhance the final top appearance even more.

This will get you started :smiley:

1 Like
3

Thank you for your Answer, i will try that.

Since your knowledge seems deeper compared to mine, i would like to ask some questions.

My experience with Bambu so far was plug and play. Clean the plate, dry the Filament and the result will be good (thats how it is with my P1S). Besides the regular calibration i did not do anything. Thats also at least what i also expected from the H2D.

Are the P1S profiles just that good (or became good over time) and the H2D Profiles are just not there yet? I just “afraid” that this is some kind of Hardware issue i am then “stuck” with etc.

If flow rate, K values etc. are the reason, why do i see the rough surface (for example on the left side of the plate) in the same spot? I would at least think it then would be more random.

Also a question about flow dynamics. Do i have to do it for each filament (even the color - for example Bambu PLA Basic Green, Bambu Pla Basic Red etc.) or just for example for Bambu PLA Basic in general and then again for Bambu PETG-HF in general etc.?

I am also hoping for the Beta Firmware since improved first layer is mentioned there. But so far i am not offered the Beta.

Thanks and best regards

4

I recommend ensuring the temperatures are correctly set before calibrating the K-values and flow dynamics, as any changes to temperature afterward will impact those calibrations and potentially require them to be redone.

5

The slicer from Bambu Studio gives you a good starting point with baseline settings for flow ratio, temperature, and max volumetric speed. However, these are just initial baseline settings. You’ll likely need to adjust the settings like flow ratio, print speeds, acceleration, layer height, layer width, and temperature or cooling parameters based on the filament and specific print conditions you’re working with. Even different colors of the same material can behave differently.

While Bambu Labs tries to automatically adjust for pressure advance, certain filament colors don’t always respond well to the auto detection system. This is why manual pressure advance test patterns are used and you would turn off the flow dynamics calibration before you print.

Other elements such as the extruder type, hotend, nozzle, and acceleration settings can also influence your results, so what works well with the PS1 setup may not necessarily yield the same results with the H2D.

Do you need to fine-tune each type and filament color? That depends on whether it’s performing as expected and the level of print quality you’re aiming for.

In the future, it’s possible that Bambu Labs will have more refined profiles for their own filaments and colors, but for now, it’s still a hands on process to fine tune the print quality.

Have a good one :v: