You can get a confirmed clean, original installer for the last version of 123D Design ever released from: https://www.softpedia.com/get/Science-CAD/Autodesk-123D.shtml . Make sure to download the 64 bit version, unless you have a 32 bit OS. I still use 123D as my primary CAD modelling tool to this day. You can continue using it in perpetuity despite it having been discontinued. To convert the CAD models you export from it to .OBJ or .FBX files you can use either MOI 3D or Unreal Engine's Datasmith feature. 123D is aretty powerful tool itself with very robust filleting functionality in its own right. But only supports rolling ball fillets.
I use MOI 3D for advanced stuff that would only be doable by approximation using Loft in 123D Design. Such as Transform => Deform => Flow and Transform => Deform => Twist. And more recently for making airfoils using Sweep, which is much more versatile and powerful in MOI 3D. You can even use 123D Design's Loft tool to make spirals but MOI is much better developed powerful there as well. Apart from that, pretty much anything you can do with MOI 3D you can also do with 123D as well.
What I like about 123D Design is its interface, which feels more familiar and intuitive to me, and how robust it is with filleting edges or deleting surfaces or faces of solids and implicitly automatically extending neighboring surfaces or facets to fill in and cover the resulting gap to keep the solid solid. |
