I don't like the layered filament change look, so this I redesigned this to be printed face down in three different colors.
Print “Tie_Color” first, “Tie_Black” second, “Tie_White” last.
You can use any colors you want instead of black and white obviously, but these colors are what I think look best.
In your slicer you can add a pause before the last 4 layers of “Tie_White” or the last 3 layers of “Merged” (I cut a layer off on the merged one cause I felt a little less plastic over the magnet might be better) or manually pause it before it prints the last few layers to insert a magnet.
Here is the magnets I used https://amzn.to/3wY9ql5
I've also included the Fusion 360 file so you can modify as you see fit, pardon the slight mess of the file, I'm still fairly new to Fusion.
The author remixed this model.