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How to manipulate individual vertices?
(lemmy.nz)
Your own 3D parametric modeler.
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
I'm not sure what you wish to accomplish. Maybe there's an easy work around? I'm guessing you chamfered a corner but wish to have different side lengths of the chamfer perhaps? Maybe you can post a screenshot with some annotations to make it more clear. I'm by no means an expert in this particular software, but I do know my way around CAD.