I bought A1 five days ago. It had been printing fine until suddenly I noticed that the nozzle has become closer to my print. I searched Bambu wiki and found out that the four black screws behind the nozzle holder has become a little loose. After tightening all four screws and redo full calibration, my next print started perfect. Unfortunately, before that print was finished, I got wrapping issue and one side of the print was lifted and it scraped the nozzle so I had to cancel the print. After that, the nozzle is scraping the bed again. I opened the extruder and recheck the four screws again but they were tight. I redo bed calibration several times but the nozzle is still touching the bed. What should I do next? I am thinking to adjust the Z axis offset but I can’t find it anywhere in Bambu Studio. Can anybody please help me?
Attached is photo of my last print result before posting this. You can see the filament is so pressed against the grid infill below that the line become bubble.
My system is: A1 without AMS + 0.4 mm Stainless nozzle that came with the printer.
Btw, I had placed a preorder for the H2D. Now I am starting to worry if this also happen to H2D. I would be screwed as that is a much more expensive machine, lol.
I’ve had this issue after about 5 days with the printer of perfect prints. now no matter what it purges fine, test line is finish but then starts clicking and just scraping the plate with no filament coming out. I checked the 4 screws and all were tight. I’ve adjusted z-offset, changed to a smooth plate, changed nozzles, ran calibrations, completely factory reset the printer and redid callibrations and nothing seems to work. it just clicks and clicks on the first layer until finally on the 2nd layer it starts extruding. Sometimes ill be able to finish a print if it stays adhereed to the plate.
yes the build plate is clean
I see that no filament is in the print but I don’t see scraping…
Did you bother to check the flow ratio calibration?
If way off it probably means something is blocked or filthy.
If the extruder struggled too much and started grinding the filament it might be full of plastic dust, unable to transport properly.
If the filament overheated or such the hotend might have a partial block and needs cleaning.
Don’t take the engine out of your car if all it really needs is a bit more air in the tires… 
Extruder clicking means extruder problems.
If it can’t extrude on the first layer than there has to be a reason.
If the nozzle INDEED scrapes over the plate I would assume the homing and plate levelling has issues - maybe worn out spots…
I just noticed that the back of the heat bed were slightly “pulled up”. I suspect it happened when I was lifting the magnetic pei plate. I am wondering if the unit I had was defective or it simply has poor built quality. I never had this issue with both of my old prusa MK3S+. This might also contribute to my z axis issue.
Same issue here. I had to replace the hot end. Then order extra screws (yeah, I did). Once I got everything back together, I ran the bed calibration program multiple times. Then I tried using the control board Z axix up arrow. Nothing works. I cannot get that neat little perfect line I used to get . Frustrating
Have you checked to see if the screws are loose behind the extruder assembly? Meaning, the four screws that hold the toolhead block to the linear rail guide. If any of the 4 are loose, the whole toolhead system is free to rock.
