Hi, I’m new in the “Bambu Game”.
My first prints were good, really good. After trying to print with ABS on the Bambu I had issues. I retry the print with PLA and after that with Bambu PLA, always with the same issue.
After a few Benchies and no good idea anymore, I try to get help from you.
I cleaned the nozzle, same result.
I changed the nozzle, same result.
The lower layers seems to be good after that 
I hope the picture is good enough.
Did you slice this benchy yourself? Or is this the benchy that is on the machine?
Do you have pictures of other prints?
The picture is perfect and thanks for posting such a clear one. It really helps understand what is going on.
If I were to guess, the stark difference in filament transition is an indicator that something in the cooling process initiate at that layer. My first guess might be to consider reviewing the cooling parameters in the filament profile. Or better yet, turn off the fan completely.
Also, since this is ABS and sensitive to temps, are you monitoring the interior temps of the chamber. ABS like it very warm, generally higher than 40c. If you don’t already have one, purchase a cheap Hygrometer with Temperature probe. This sill allow you to independently verify internal temps of the chamber.
I did 1 by myself and the others from the Machines SD Card.
Since the printer performed good in the beginning and only has issues after printing ABS. Since the print is good initially and at the end of the print…
It apears to me that something is technically not right with the machine. Maybe some filament got stuck on the Z-axis leadscrews or guiding rods. Or something underneath the machine got stuck in between the belts that drive the Z-axis, belts damaged, something like that…
Try checking if the machine has any of those problems…
I already checked the Belt under the printer and the Z axis and found nothing…
I have the problem also with PLA.
The black Benchie is in PLA.
Better contact bbl support then… I can’t imagine this being a setting problem…
Good luck.
This kind of layer separation issue is classic symptom of filament not reaching a sufficient molten state and therefore flowing incorrectly. It may seem counterintuitive but a filament being both too hot or too cold can cause this.
If you haven’t already tried this, I’d recommend loading Orca slicer onto your system so that you can run some manual calibrations which Orca has but Bambu Studio does not. Since it’s a clone of Studio, it will feel the same and it can coexist on the same machine so you’re not forced to make a choice.
Here’s an example of a problem I experienced two weeks ago that had me baffled. As it turns out, the filament I had been using previously, all of a sudden, wouldn’t flow. The one on the left was before and the one on the right was after I realized that the part cooling fan was not turning on. As it turns out, the connector had come lose.
Here’s the difference in menus between Orca and BS.
Orca - Don’t bother with the Bambu calibration button.
This should at least give you some reference point as to whether or not your temperatures are being relayed accurately to the system and/or that cooling is turned on correctly. That’s because when the calibration routine runs, it also temporarily modified the cooling parameters.
This will produce a temperature tower that will already have the GCode modified to change the temperature at each section of the tower. Note that with STL models found on printables or elsewhere, you would be expected to modify the GCode yourself.
Contacted them…
Thx…
I hope I get a fast answer?!
I’ll give it a try.
See you in 20 mins
I had the same issue while doin the Temptower.
It looks like there is not enough filament coming out of the nozzle.
I took the HotEnd out and the Extruder as well checking all the gears. I found nothing.
I reassembled it, and I’ll try another Benchy.
Here’s a tip. Forget the benchy as a test model for the time being. Use a simple cube primitive and scale it to 50mm tall. This will save you time and filament and will provide a very start indication of whether or not there is issues with part cooling at a specific layer.
You can also perform the same test with a cylinder primitive.
There is another item you should test, simply to rule it out. Either format your current SD card (use the printer’s format utility, not your computer) or, better yet, use a different SD card. There is a remote possibility that your card is corrupt or causing errors.
I tried to print a cylinder in vase mode 50mm high. This is how it looks after the few first layers.
The rest came out pretty good…
OK. This is a smoking gun that you have a temperature and/or flow problem. This photo is most likely caused by your bed temperature being too low AND your filament temp being too low and/or you filament is not getting through the nozzle at the right temp and volumetric flow.
You did not mention but are you using an AMS? If so, have you performed a test without the AMS just to rule out filament binding in the feed?
I might also suggest first running a first layer test to work out the bugs in your temp and feed before wasting any filament. A first layer test is unforgiving and will tell you a lot about your plate hygiene, temperature and filament flow. Here’s a quick and easy way to run that which take less than five minutes.
Take a cube primitive and scale it to 75x75x0.20mm. Use a 0.28 layer height. This will ensure that only a single layer is deposited. If you are not getting smooth flow then first, increase your bed temp to 65c and the filament to 240c to see which one of these tests change the conditions. Remember to FIRST run the test with no changes so that you have a control in your experiment. If I had a dollar for every time someone just rushes in before establishing a controlled test condition…
If you’re not getting a smooth result like this, then you have to solve this issue first before moving on to fixing your benchy.
How can this ever be a flow / temperature problem if the upper part of the print looks great???
The printer is going not far enough to close the gap between outer and inner.
Seems to do too short runs?!
I don’t know how to explain.
I have no AMS running…
Had reset the printer now, let all his calibration running, will test after that…
There must be something wrong with your machine. Let BBL support deal with this. Might want to try the new chat function!
After several calibration test after setting the machine back to factory settings.
And it didn’t work.
After that I tried a square 50x50x0,28
The printer run a self test after failing.
An now it work like nothing happens before.
Everything is fine, again.
Thank you for your help guys!
