Problem with 0.2 nozzle 3 layer print

[Dalpy97]

Hi everyone, I’m not sure where the problem is with my print so here are the details:

• Printer: Bambu Lab A1
• Plate: Smooth Hot
• Nozzle: 0.2 stainless steel
• Layer height: 0.06mm (I set also the first layer to be the same height of the others)
• Others slicer settings: from default I only changed the surfaces pattern all to rectilinear for the strength of the print.
  
  
• Filament: Always PLA, tried BambuLab Matte and Basic or Sunlu Matte and Normal

In the followin image you can see a print with sunlu pla normal with generic pla profile that i stopped mid print beacuse clearly was not doing well.

Yesterday I read different posts on this forum on similar issues and one of the suggestions was to increase the bed temperature so i did some tests today increasing the temp of the bed of 5° for each test and some results were promising since with a temperature of 80° the result was way better but still not perfect and going above the result was worse.

print with bed at 70°

If you look closely the border do not have the same definition as the center

print with bed at 80°

Here the borders are way better but still not perfect

Then I tried the same model but scaled up (except for layer height that is still at 0.06mm per layer) with a bed temp at 80° but the result was bad as you may see in the following image

Originally the model had layers of 0.08mm to be printed with a 0.4 nozzle but even in that case the prints were not perfect, good but not perfect and i suspect that the problem may be the same.

Am I deluded into wanting a perfect print?

Hope someone can help me and thaks for your time.

[Dalpy97]

Some additional info I forgot to mention:

• the 4 screws behind the nozzle have already been thightened
• from one print to another I always use isopropyl alcohol to clean the plate… once i tried to clean it with dish soap but ther result was the same
• the filament is in the AMS with an internal humidity almost alway below 30%
  (depending on the last dehumidification done on the silica)
• already tried to slow down the print speed at around 50 mm/s and seemed to do better for the first two layers but worse for the last.
• for every print the flow calibration and bed leveling is enabled

[Shadows]

Hey there! Hope you’re having a good day…

From what I’ve seen I think the layer height is too low which may cause issues like this, if you’ve got a 0.4 nozzle lying around I suggest switching to that or raise the height to around 0.1mm-0.15mm, if you’re using a Generic PLA you should also check what plate it might need because sometimes (might be wrong) the plate might be incorrect for it.

I hope this can help, let me know if this works.

Have a good one.

[Dalpy97]

Hi, thank you for the answer.
You are probably right, I have already printed the project with a 0.4 nozzle with layers of 0.08 (which is the minimum possible with that nozzle) and with that, the print is fine, not perfect but reasonable…

I have done lots of testing…
the project needs to have 3 layer total, 2 for strenght of the print and the last one for the pattern;
I tried 2 layers total only 1 for the base and 1 for the pattern and the final result it’s lighter and more flexible but also more fragile (that is why i need 2 layer for the base)

I my mind the solution was to print the model with 3 layer total as thin as possible, doing this I would get a final model that is resistent, flexible and light and would be perfect but the printer seems to not like that idea…

And about the plate as I said the 0.4 prints fine so i doubt is a plate problem but I will still try on another just to be sure…

[Dalpy97]

I did it!!!

The solution was to heat up the bed at 80° and also reduce the speed of the print, the result was pratically perfect for both bambu pla matte and sunlu pla matte… slightly better with the bambu filament but not relevant.

In the end I didn’t try another plate because I found the solution before.

I hope that this could help someone to perfect their print.

Happy printing everyone!