Lee Mac is a legend in the AutoCAD community. His version of TLEN.LSP is the industry gold standard. It is bug-free, well-commented (safe code), and completely free.
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TLEN works with whatever you select. Use the FILTER command or QSELECT before running TLEN to sum only red lines, or only lines on Layer "Electrical." Lee Mac is a legend in the AutoCAD community
of multiple selected objects (lines, polylines, arcs, etc.) at once. If you're looking for free solutions, consider these
While Autodesk’s official store focuses on packaged apps, their discussion forums contain user-uploaded .LSP files. Look for posts by "Autodesk Experts" (marked with a star).
Keep in mind that AutoCAD LT and LISP (T) files might have specific licensing terms and conditions. Always review the licensing agreements before using or distributing these files.
There is no such thing as a "cracked" version of a free LISP routine. If you see a website offering "TLEN LSP crack" or "serial key," it is 100% a virus or a scam. Legitimate TLEN scripts are plain text files—they don't need cracking.