My A1 not waiting for nozzle temperature before prints. So it start printing with 140 ′C. The first lines of filament have now chance to stick until the nozzle temp get over 210 ′C.
How to fix this?
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I’m having this same issue with my A1. Extremely infuriating since the start up sequence takes so long.
Add M400 in the startup code after the startup temperature command.
M104 S{nozzle_temperature_initial_layer[initial_extruder]}
M400
That will solve your problem.
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Thanks! I was about to dig into the gcode/3mf to see what was going on.
Surprised to be having this issue especially since it’s an obvious profile issue straight from Bambu.
I see it is in the GCODE for the A1 but has been left out of the string, maybe someone made a mistake.
G28 Z P0 T140; home z with low precision,permit 300deg temperature
M104 S{nozzle_temperature_initial_layer[initial_extruder]}
;M400
;M73 P1.717
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I checked your solution, and it does not work. Where can I find the list of G and M codes to study this problem?
Could this be the problem here? (M109 S10 H140)
;====== cog noise reduction=================
M982.2 S1 ; turn on cog noise reduction
M1002 gcode_claim_action : 13
G28 X
G91
G1 Z5 F1200
G90
G0 X128 Y0 F30000
G91
G1 Z-5 F1200
**M109 S10 H140**
M17 E0.3
M83
G1 E10 F1200
G1 E-0.5 F30
M17 D
G28 Z P0 T140; home z with low precision,permit 300deg temperature
M104 S{nozzle_temperature_initial_layer[initial_extruder]}
;M400
;M73 P1.717
;===== prepare print temperature and material ==========
M1002 gcode_claim_action : 24
I had this problem kinda like this too; a firmware upgrade to 01.01.01.00 fixed the issue for me. (I was on like 01.01.00.30 or something initially; worked fine with the files on the sd card but would not work with my own files.)
Though if you’re already on the upgraded firmware, you’ll want to try the gcode.
I have updated my firmware, and the issue occurs with the default G-codes on the SD card and in the G-code generated with Bambu Studio. My problem is that the machine attempts to retract the filament without first heating the nozzle.
I have the same issue but a power cycle solved it.
I have switched the printer on and off several times, but the issue persists. 
did you try to update to the latest firmware? I having this issue initially, but works normal after update.
Yea i do recommend you to use the latest bambu firmware all the time.
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I have the latest firmware on my Bambu Lab A1 (01.01.01.00) as of January 12th
ganzen unten bei deinem Code ;M400 zu M400 - also ; entfernen.
I’m afraid that it does not work. Maybe it’s an internal G-code called by an M command. 
Normal GCode is used 99% of the time. This makes it easy to understand what is being done before printing.
Question: Is the light turned off before printing starts?
We have this line at the end that contains an M400.
;========turn off light and wait extrude temperature =============
M1002 gcode_claim_action : 0
M400
Not sure about your original issue but the back of your printer is too close to the wall.
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There was enough space, even more than recommended in the manual. The cable was not forced at any time.
By the way, I moved the printer a little following your advice. 
If you say so, just looks like it’s rubbing the wall in the video.
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