how can I make the lines start from the edge of the model instead of the middle

[YenJiWai 1]

it always start from the middle

[GregValiant 1,351]

This can be caused by many things.  It's impossible to tell what's going on without the model, your settings, and your printer.

Load the model and set Cura up to slice.  Then use the "File | Save Project" command and post the 3mf file here.

[YenJiWai 1]

EZ_2层间隔24.3mf

[GregValiant 1,351]

@YenJiWai that is a model file.  I need a project file so your printer and settings are included along with the model.

[YenJiWai 1]

EZ_2层间隔24.gcode

[YenJiWai 1]

2层间隔24.stl

[GregValiant 1,351]

Still no project file so I don't know what your settings are.

In the "Travel" section of the settings is "Layer Start X" and "Layer Start Y".

In the "Walls" section are "Zseam Alignment" and "Zseam Relative".

When I slice your STL file all moves start from the Left Front Corner as that is where I told Cura to put the Z seam.

Since you have an Origin at Center printer, maybe moving the model to the +X, +Y quadrant of the bed would make a difference.

The "Moved" file is with a round build plate and has the model slid over a bit to +X +Y.

 

GV_2层间隔24.gcode

GV Moved24.gcode

Edited February 6, 2023 by GregValiant