Surface in FreeCAD
Surface Modeling in FreeCAD
All Dimension Are Assumed
I Design Surface part by Surface workbench
FreeCAD is a free and open-source general-purpose parametric 3D computer-aided design modeler
and a building information modeling software with finite element method support.
Downloads FreeCAD software from this site
https://www.freecadweb.org/downloads.php
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Step 1: