Hi All, just got my A1 2 weeks ago and its already developed the problem of the head hitting the print. I noticed it when doing a print that was about 30mm high but it didn’t seem too bad. Today I have tried a print that is 140mm high and from about half way it started hitting and this developed until at about 135mm it started hitting and dragging the filament across the print, with the result that 8 hours of printing is now scrap.
What concerns me more that the fact that there is a problem is that this appears to have been around for the best part of a year and there doesn’t appear to be any action from the manufacturer.
Does anyone from Bambu Labs read these reports?
If so where is the solution?
If there is no solution after all this time then I’ll be returning this one as unfit for purpose.
I’m having the same problem, so many prints get knocked over by my 1 week old Bambu a1 (sliced with Bambu lab) but get printed fine by my ender 3 (sliced with Cura with very similar settings).
On the a1 I can hear the friction while the nozzle moves in X-Y area and seems to touch especially while it moves over tree supports.
I think about returning the A1 and staying with my ender instead. Of course it’s slower but at least my prints never fail, like they do with my A1.
Considering that this issue is almost a year old and there’s no sign it will change, I can’t recommend anybody to buy an A1.
(note: I always cleaned the built plate with dish soap. I tried many settings and profiles, and different types of filament. I still get this problem)
Furthermore I want to add that the discussed workarounds (increase z hopping, retraction threshold to 0) are not acceptable since they increase printing time drastically.
Just avoid grid infill, or every infill pattern that crosses on the same layer and add too much plastic. The nozzle is hitting when it goes over those crossed line.
Hi all, I am using my A1 for 4 months. Last 1 week I am struggling with nozzle dragging issues. I realized this when I printing female storm trooper figure. I tried maybe 5 times and every time nozzle knocked model at the same time and same place.
I changed infill pattern to gyroid, also shut down reduce infill retraction. Make .8 Z hop when retract. Still got same issue. Any advise or I am gonna burn it. 
This is the solution that worked for me. Don’t use ‘grid infill’ for tall parts. Use something like rectilinear. That worked for me.
My situation is quite similar to yours, I’ve had the nozzle of my a1 drag in my print as well. Somehow after a couple of uses the problem dissapeared through calibration after calibration, in likelyhood if it does not disappear u should report immidietly to customer support of bambu.
Hi had same issues with poor first layer and nozzle dragging after rebuilding the hotend assembly after clogging issues. Tried all suggestions but no avail so I took out the mini board at the rear of hotend assembly and reset the filament detector ribbon cable and that seemed to be the trick and now the machine performs perfectly
I opened a ticket to bambu lab because my a1 mini was making a cracking sound before digging in the printbed and they gave me lots of things to try but non of them work
Im having the same problem after replacing the cooling fan and hot end assembly. Now for some reason even though the bed level check is OK, when I print anything, the nozzle is dragging across the bed and scratching it up.
Manual bed tramming fixed my issue so far! Gonna keep testing a few prints and hopefully I can lay to rest the nozzle running into my prints and ruining them. Thanks so much for your suggestion here!!
I´ll do beg my pard for kidnapping your thread here.
Since im to “new” to make my own thread. but after the latest update on both the printer and lab studious. my printer seems to miss-behave rather badly with it´s stock 0,4 mm nozzle. it has worked rather okay with minor Clogs. but now it seems to scrape the nozzle into the prints it self no matter what quality print settings im using.
sorrie and thank you in Advance//Scrappy_scruffy
Same.
I had taken the hotend out more than once and tightened the 2 on the main housing (larger hex) and then the three that you can see when you first remove the hotend (also larger hex). I didn’t even spot the four on the back of the “plate” that comes out when you remove the three at the front.
As soon as I tightened the four screws (using the smaller hex tool) I was able to print a turbo benchy without issues. I’ll be trying something larger tomorrow.
Were the screws noticeably loose?
I would say they were a quarter turn away from being tight. Certainly looser than the screws behind the mounting plate.
I ran a delicate vase earlier this morning and it came out pretty much perfect. I need to test the print I was originally having trouble with, which I will be doing a little later today.
Thx.
I’ll try it on my A1 mini on the next maintenance.
For everyone having this problem, please tighten all the screws in the hotend as shown in the last part of this wiki article A1 Series First Layer Print Issues - First Layer Too Low, Hotend Moving | Bambu Lab Wiki
The A1s shake these screws loose over time, I just had to do this with my a1 after less than 30 days of ownership lol.
Brand new A1, had it for a month and occasionally it makes “interesting” patterns but only on 0.08 layers…I checked the screws (remove the extruder, undo the 3 visible back screws and gently drop the back plate to get to them) and got a good 1/4 turn on each one…doesn’t sound much of an issue until you consider the thousandths of an inch precision that these things work at…
will see if it makes any difference
One year later I bought an A1 and had the same problem when printing with the 0.08mm high quality profile. Your suggestion solved my problem thanks a lot!
I tried raising a ticket, but it refuses to upload the printer log files and won’t let me submit the ticket without them.
Shows the zip file with 0 bytes and can only retry the upload (doesn’t work) or delete them