This tool can not only keep the z-axis path free of deflection when lofting, but also set the x-axis and y-axis, and even select a segment of line as the axis to keep the non deflection.
Upright Extrude（Upright Extrude）Animation Tutorial
Loft the selected face along the selection line while keeping the lofted section upright.
Set Upright Vector By Coordinates（Set Upright Vector By Coordinates）Animation Tutorial
When a coordinate axis is used as lofting, the vertical axis shall be maintained.
Set Upright Vector From Edge（Set Upright Vector From Edge）Animation Tutorial
Keep the vertical axis when selecting a line as the loft.
做螺旋坡道很方便！