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Made a wallpaper based off of my FreeCAD Designs
(programming.dev)
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.
They are Tech Drawing then cleaned up with InkScape.
https://wiki.freecad.org/TechDraw_Workbench