Even when I turn off flow calibration, my X1 Carbon will still print a line of filament along the right hand side and back side of the plate prior to starting the actual print. There does not seem to be a way to disable this and the touchscreen doesn’t appear to call out this operation specifically. Is this a means to prime the nozzle, or does it provide some other function?
Thanks!
It’s a purge to equilibrate chamber pressure prior to printing so that the first contact of the nozzle is as clean as possible. All my Prusa and Creality printers do this. The Bambu extrusion calibration does not preclude this function.
Thank you for the info!
For the P1P it is labeled in the start code as “noozle load line” [spelling error is not mine]. You should be able to find a similar section in the X1 code.
You are correct, it is just to make sure that the filament is flowing well before starting to print. You can edit the start code to shorten it, or change the location, etc.
Thank you. I will take a look in the start code for the “noozle” line. 
That’s the line in the back.
The line in the front I would call “nozzle ooze line”, it prints and then gets scanned with hot nozzle hovering over it. Pretty sure it has some (supposed) purpose other than to prime the nozzle (it doesn’t), and because it is scanned it must be part of some other logic (maybe if nothing extrudes then something happens?) I suspect it’s part of junk gcode that BL seems to like to keep for no reason they can recall 
That’s interesting. I would love if the printer provided more complete notes about all of the little procedures it does prior to printing.
I agree, I don’t mind all that stuff going on, but, why? Like if it’s just left over code from R&D, them get rid of it… If it does something, just tell me what it’s doing and why. I’ll pretty much accept any explanation to include “We just like the way it looks when the noozzel does that…” 