Cura behaves different with placing a model  as a .STL or .3mf file. While a .STL file will be placed in the middle of the print plate, it will place a .3mf file related on the model coordinates and its center of origin in xy. This is what you are recognize when you import your model as 3mf. Here a example how Cura behaves with a simple model exported from Fusion360: Model (out of center of origin at x=-15mm,y=20mm):     Imported as STL:     3mf impo