I purchased an STL file from ESTY but need to make some changes to it before cutting. What program can I use to make changes to an STL file?
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You need a 3d program that can open an STL file. I myself use Rhino3d. Fusion360 probably does, as well as a bunch of others. Use google to find one.
Microsoft’s free “3D Builder” is available from their APP store.
Inkscape/Draw freely. I have used it many time’s to make changes or add to my dxf file’s.