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The 3mf has modified G-codes

Bambu Studio opened a project with The 3mf has following modified G-codes in filament or printer presets:, a list of names, then Please confirm that these modified G-codes are safe to prevent any damage to the machine! (Plater.cpp). OrcaSlicer says The 3MF has the following modified G-code in filament or printer presets: (Plater.cpp).

Can I print it anyway?

Yes, once you have read what changed. The printer runs this G-code as it is, so a wrong temperature or move happens for real.

Why does the slicer warn?

The project's printer or filament preset carries custom G-code that differs from the system preset it is based on. Bambu Studio checks 12 settings (PresetBundle.cpp):

Setting Runs
machine_start_gcode, machine_end_gcode Before and after the print
filament_start_gcode, filament_end_gcode When a filament starts and ends
change_filament_gcode At each filament change
layer_change_gcode, before_layer_change_gcode At each layer
machine_pause_gcode At a pause
time_lapse_gcode For each timelapse frame
printing_by_object_gcode Between objects in by-object mode
template_custom_gcode Where you insert custom G-code on a layer
wrapping_detection_gcode For the wrapping check

The 3mf has following customized filament or printer presets: is the same warning for a preset that no system preset backs at all.

Is the file dangerous?

Usually not. Designers tune start G-code for purge lines or a cooler bed. Read it anyway: a start script can set temperatures, home off the bed, or save settings to the printer's memory with M500, which outlives the print. See can a .3mf carry a virus.

How do I read the G-code with preslice?

  1. Drop the .3mf on preslice.co.
  2. Open the Raw tab and open Metadata/project_settings.config.
  3. Search for a name from the warning, such as machine_start_gcode.

Look for temperatures (M104, M109, M140, M190), M500, and any line you cannot explain.

How do I get rid of the warning?

Load the file, then pick your own printer and filament presets in the slicer. Their G-code replaces the file's.

Can I turn the warning off?

Yes. Both slicers put a Don't show again box on the warning. Leave it unticked if you open files from people you do not know.