A challenging print that looks great as a pen pot!
I found I needed to add a modifier at the top of the print where the slashes finish to slow the print down at that point. I also increased the z lift height to 1mm and ticked the avoid perimeters box.
Printed at 0.25 later height, 3 perimeters and no infill, no supports.
The insert is a solid STL so you just need to print with no infill, no top layer, 2 perimeters was fine for me.
Also - tip is to set the seams to Align - I do this for most prints.
The author marked this model as their own original creation.