Because TLEN.LSP is an open-source, community-driven script, it is not hosted on an official Autodesk marketplace. To get the best, cleanest, and malware-free version of the script, you should utilize trusted CAD community hubs:
This is the fastest method if you only need the tool for your current session.
Many CAD managers maintain public GitHub repositories featuring optimized collections of classic LISP routines, including tlen.lsp . autocad tlenlsp download best
This happens if the file was not successfully loaded. Re-run the APPLOAD command and ensure you see the success message.
For , Method 1 (Copying the source code from Turvill.com) remains the gold standard. Create the file yourself, inspect the clean code, and load it into AutoCAD using the APPLOAD command. It's simple, effective, and safe. Because TLEN
While you can locate pre-packaged copies of this script across developer repositories like GitHub's AutoCAD Lisp Collection or user threads on the Autodesk Community Forums, the safest method is creating the raw .lsp file yourself. This protects your workstation from corrupted third-party downloads.
changes the game. You simply load the routine once, select all the objects you want to measure, and it instantly returns their combined length. Its true power is in its speed and simplicity—no complex data extraction, no manual addition, and no risk of forgetting a single segment. This happens if the file was not successfully loaded
4.3 System Hardening
If you want AutoCAD to automatically load this tool every single time you launch the software: Type APPLOAD and press .