Extrution before resuming after a wrong place message

Bambu Lab X1 Series
1

My first layer is never done correctly if I have a wrong plate detection. After the printer detects a wrong plate or absence of QR Code, it pauses over the trash bin and waits for a resume. When I click on resume it excludes 2 or 3 mm of filament. Then it checks the home plate position and because the new filament is stuck on the nozzle, the bed is too low.

I checked also what happened when I clicked manually on pause/resume and I saw the same behavior. 2mm is extruded from the nozzle. Is it normal?

I see only one command in Bambu Lab Studio Pause configuration. It’s M400 U1 . Is U1 is a extrude command?

2

Welcome to the forum.

U1 is what Bambu uses for “Pause for user”.

The QR code bed checking routine seems to be baked in the firmware. There are a couple M-codes that are undocumented (M977 S1 P60) and (M620 M) that might have something to do with calling the QR code subroutine in the Start gcode. I haven’t been able to figure them out.

I’ve just gotten in the habit of completely restarting the print when I have the wrong plate in instead of trying to continue.

2 Likes