??? Blender? :D it may be a pain in the ass, but you can certainly do it with blender
this post was submitted on 27 Feb 2021
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Do-It-Yourself, Repairs and Fixes
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Dimensions and a cad program?
I've never been good at calculating bends. Otherwise, any 3d modeling software works. You could just use cylinders instead of empty pipes if that doesn't matter.
There is FreeCAD and Fusion 360 available for free on the web. I believe Fusion 360 only limits you on the total number of projects you can have active at once. FreeCAD is free, but I found it to be a little harder to use than Fusion for some things. FreeCAD has good tutorials to get you started if you go that route. Idk if Fusion has tutorials, I already knew how to use Fusion before jumping in. Best of luck!
Tinkercad is another great tool
I'd use blender, but only because I know it better than cad programs
Sketchup is pretty decent and there should be a few browser version on their website. It's super simple to use as well if you're just going to be drawing a basic structure you'll only need like 3 tools.