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）动画教程
Loft the selected face along the selection line while keeping the lofted section upright.
Set Upright Vector By Coordinates（Set Upright Vector By Coordinates）动画教程
When a coordinate axis is used as lofting, the vertical axis shall be maintained.
Set Upright Vector From Edge（Set Upright Vector From Edge）动画教程
Keep the vertical axis when selecting a line as the loft.
做螺旋坡道很方便！