Hello, my device is a1. After an 18-hour print, I changed it because the filament ran out when it reached 98%. After changing it, I started it and it worked for about 10 minutes. But later I realized that it worked empty without any flow at the nozzle end and did not take the filament in. Therefore, it worked empty for about 10 minutes. Now I noticed this and stopped it.
Now I fixed the flow problem, but due to the wasted time, if I start it, I will not get a proper result because the extruder remained above the normal printing level. Can I pull this back? Because if I cannot fix it, about 500gr of filament will be wasted. It is terrible that I am exposed to this at a level of exactly 98%, I do not know what to do.
There is only one way I know of and that’s not a pretty one…
Measure the exact height of where the print failed.
Cut the 3D model at this height and slice only the missing part.
Since you can’t start printing in mid air and the machine will use the standard start sequence you would have to modify the G-code accordingly, manually that is.
I did it a few times with my old printer but with Bambu it is too much of a hassle.
I recommend to try this way:
Start over…
Meaning you take the model of the plate, clean up the top using sandpaper on a glass plate or such and only print the missing part again.
If the first print ended clean only sand it flat to remove incomplete lines sticking out.
Measure the exact height you are left with and slice the model to match with about one mm extra at the bottom.
No bottom layers for this one.
Check the fit and sand down using a glass plate as the base until the out layers match up nicely.
Glue together and be happy - if not add a layer of spray paint to hide the seam and to give it a nice shine 
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