Hi,
I completly new to 3d Printing and got my new a1 Combo with some Bambu Basic PLA, Directly from Bambulab Store.
First Prints we’re all a success, except one Thing.
The printer is constantly Oozing Filament before, after and during homing movement while Printing.
So there is a constant flow out of the nozzle, and These little chunks of Filament then get stuck inside the Print.
I only printed Things from makerworld (scrapper, Poopbucket, …) with respective Default Profile.
Only General setting i changed we’re the Filament “K” Setting with the Flow Calibration from 0.02 to 0.015.
Everything else ist Default.
Has some one similar Problems ?
I share some Pictures as soon as the current Print ist finished.
Lines at the Front of Plate
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I have the same oozing problem. Doesn’t make a difference if it’s PLA or PETG either.
Not found a solution yet. It only seems to create problems in the first few layers. I manually remove the ooze when I see it at the start of print.
Looking forward that somebody solves this.
I think the calibration lines at the front mitigate the problem a little bit.
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I tried reducing hotend Temperaturen. From 220 in 5°C steps to 205.
I also increased retraction distance to 1.2mm (from Default 0.8)
I think this Made IT a little better, but Problem ist still there.
I did not have this issue before. But this weekend finally sat down to replace the heat bed and upgrade printer firmware, and now it does happen constantly, wonder if it has somethign to with the firmware.
I did some Test.
I turned the printer on, without a Print selected.
and increased nozzle Temperature from 160°C in 5°C steps.
The pla in the nozzle started extruding right around 170°C.
Printed a toture Test from makerworld, with timelapse on. Many Strings and Bits from idle movement
Could Not Finish Print, because the excess Filament from idle movements ist everywhere in the Print.
I Check If i can downgrade to an older Firmware and repeat the tests
IT seems Like temp ist way Higher then Set, or Something.
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@internetofmine Which FirmwareVersion did you install previsously ?
I tried the last 2 Update back from 1.02.02 (current) to 1.02.01 and 1.02.00.01. No Change.
Did you use an older Firmware Version ?
I did two updates on weekend, so I’d guess 3rd one was what I was sitting on before the weekend. I will do some tests tomorrow (turning off tangle and ooze detection) and revert version after tomorrow.
I will have to start with the obvious, did you dry the filament after you discovered the oozing? Even new filament from an intact vacuum pack can have excessive moisture which can lead to constant oozing due to the moisture content boiling in the nozzle
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@Panamon_Creel No I did not, and at the moment this is also my best lead.
I printed a temp tower today (on newest firmware again)
And even at 190/195 °C strings are present.
At the start @230°C I even heard some “pop” sounds.
And holes visible in the pruge line at the front.
So I think this new pla role I got from bambulab store is not dry.
I currently have no filament dryer, but i ordered one.
Will give an update, as soon as it arrives.
Imo filament drying is overrated, it takes long time for PLA to get enough moisture to affect anything. I had problems pop up overnight with difference being new heatbed and bunch of updates.
I solved mine today, from a broken print with filament sticking out of model, to perfect print, with difference being turning off extra features like tangle detection and one more which names i dont remember, and it just printed fine without any extra wierd oozing.
@internetofmine
Wow cool that you could solve it.
I would appreciate it, if you could say me which settings you changed and where I can find them ? In bambu studio or in the printer ?
Thanks a lot in advance 
My issue was prints having much worse quality (layers lines darker/lighter, and parts of filament ‘pop up’ from the model), like here:
This happened overnight after upgrading software and changing heat bed. Heatbed didnt seem to be a possible culprit, so I checked Print Options on bambu app. It was “Filament Tangle Detection” and “Nozzle Clumping Detection”. They should be available either in phone app or directly from printer. If you wont find it, I will have a look at printer tomorrow and let you know >exactly< what I did.
That helps a lot. I will try it tomorrow and post results here.
Thanks a lot for the details 
Just searched the wiki for these functions.
Nozzle Clumping Detection seems to be the problem.
In the wiki they even Mention, that through the additional motions to the edge of the build plate it can come to leakage and artifacts in prints.
“1. Because the nozzle will travel a certain distance during the clumping detection, there will be a certain degree of leakage under the nozzle, and it will increase with the height of the model. If the height of the printed object is more than 70mm or you care about the print quality, it is recommended to add a wipe tower, otherwise, there may be defects on the surface of the printed model, as shown in the following figure:”
They also mention that movement during time-lapse (that’s my problem case) can cause these artefacts.
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I am experiencing the same oozing and odd lines at the front. My A1 has always laid down to neat lines at the front of the plate before printing. I never noticed oozing while homing before, but it is definetly doing it now. I think there was a firmware update recently. I wonder how I can try backing off to previous version?
@user_4066957080 do you have the tangle and the Clumping detection feature active ?
Or do you take time-lapse with build in camera ?
Can you try to deactivate theses feature ?
And just in case do you dry your filament?
I had no time today, to try it myself, to verify the solution
This does seem to be a recent problem. Ive had a print ruined by it. The nozzle just keeps leaking so it starts the print with a tail of filament hanging out of the nozzle.
It didnt do that before the last firmware update (after the new bed fitting), and the new shape purge lines.
