The TLEN.lsp script is a widely used, free AutoLISP utility designed to calculate the total length of selected objects in AutoCAD, a feature not available natively. It works by loading the file with the APPLOAD command, after which typing "TLEN" allows users to select lines and arcs to get an aggregate measurement. Free versions and community discussions regarding the script are available via the Autodesk Community forums and GitHub gists.
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(often found as "TotalLength" or "tlen.lsp") automates this by allowing you to select a group of objects and immediately see their sum total in a message box or command line. Performance and Use Cases The TLEN
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