I printed rsilvers' remix of Karl William's M2 Z knob, but I missed being able to use tomlombardi's Z axis stay. So I made one.
OpenSCAD file included, but not customizable because it relies on the knob STL. Download both to edit dimensions. It does take some time to generate, so have patience.
Should also work with Karl William's knob original version.
Updated to include version with beefier post.