3D Spiral Stair lets you build complete, high-detail 3D spiral stairs including center post, post plate, tread supports, balusters, and landing and optional riser closure.

1 Copy the 3D Spiral Stair.fas and 3D Spiral Stair menu files with the extensions: mnu, cui and cuix to your AutoCAD Support directory.

2  Copy the 3D Spiral Stair BLOCKS.ZIP (e.g. to a 3D Spiral Stair directory) and unzip the file. Make sure you set the desired location in the Support File Search Path. (Tools -> Options).
Go to Tools - Load Application and select 3D Spiral Stair.fas.

3 Pull-down menu: (AutoCAD 2000 thru 2005)
Type Menuload. On Menu Groups, browse and look for 3DspiralStair.mnu on your AutoCAD Support directory.
(On files type choose Menu Template *.mnu). Open the file and Load. Type Yes on “Continue loading mnu file”. Go to Menu bar. Pick a position on the Menu Bar List, press Insert and then Close. The pull-down menu should appear on top of your screen.
Pull-down menu: (AutoCAD 2006 thru 2009)
Type Cuiload, then Browse and select 3DspiralStair.cui, then Load and Close. The pull-down menu should appear on top of your screen.
Pull-down menu: (AutoCAD 2010)
Type Cuiload, then Browse and select 3DspiralStair.cuix, then Load and Close. The pull-down menu should appear on top of your screen.