The seat most drafting offices actually pay for AutoCAD LT gained AutoLISP in the 2024 release. For a version whose entire identity for thirty years was "the one you cannot customise", that was a genuinely big change, and it went past most people without a ripple. It matters now for a reason nobody planned. Ask a chatbot for an AutoLISP routine and it will happily reach for … [Read more...] about AI-Written AutoLISP on AutoCAD LT: What Breaks
AutoLISP Routines
Wisey’s Steel Shapes: Free Steel Section AutoLISP
Name: Wisey's Steel Shapes — Free AutoLISP Program for Drawing Structural Steel Sections in AutoCAD and BricsCADDownload:Wisey Steel Shapes.zip Version L May 2026 - 61.5 kb file size.Description: Wisey's Steel Shapes is a free, open-source AutoLISP program that draws accurate 2D profiles of structural steel sections directly inside AutoCAD, BricsCAD, ZWCAD, GstarCAD, … [Read more...] about Wisey’s Steel Shapes: Free Steel Section AutoLISP
Free AutoLISP Routines for AutoCAD (100+ .LSP Downloads)
Every routine below is a free download, collected here since 1999. They are grouped by the job they do — jump to the section you need, or use your browser's find to search the page. New to AutoLISP? Start with the AutoLISP guide and ten-lesson course. New for 2026: AI assistants can now write and run routines like these directly in AutoCAD — see Claude + … [Read more...] about Free AutoLISP Routines for AutoCAD (100+ .LSP Downloads)
ZP LISP Routine: What Zp1.zip Actually Does in AutoCAD
This one needs a correction before anything else. The listing below describes ZP as a routine that "sets all lines to zero elevation". The file inside the download does nothing of the sort. It works on blocks rather than lines, it does not flatten anything to zero, and it writes a coordinate file as it goes. The description has been attached to this download for years, so if … [Read more...] about ZP LISP Routine: What Zp1.zip Actually Does in AutoCAD
Windows with Multiple Mullions Lisp Routine
Name: WIN Description: This routine draws windows with multiple mullions in plan view between any two lines at any angle, without the use of a block. It works best if the lines are parallel, but is not required. The routine will place the mullions and glass on the current layer, and it will place the wall jambs on the same layer as the walls. I have included two functions. One … [Read more...] about Windows with Multiple Mullions Lisp Routine
WBLKALL LISP: Export Every AutoCAD Block to Its Own DWG
WBLKALL writes every block definition in the current drawing out to its own DWG file in one pass. Instead of running WBLOCK once per block and typing each name, you run one command and walk away. It was written in 1993 by Chris Bryant, and for a file this old it is unusually tidy code: it declares its local variables, saves the EXPERT system variable before changing it and puts … [Read more...] about WBLKALL LISP: Export Every AutoCAD Block to Its Own DWG