Hmmm. There are many drafting software out there, each with their own benefit to whoever user. Going for budget CAD software that works, my vote goes to VariCad.
I work in a company that has so many cad users on all levels, that I can always ask to check out something.
Now, being used to use CAD/CAM since apprentice ( early 90is ) and with a solid understanding of physics and a hands on experience with the real capabilities of production machinery ( cut, bend, fold, mill, drill, turn, ...ect)
Cubify looks interesting. But go for the 200 $ design rather than the intro version.
Variacad is currently around 600 euro for a full version for the first year. Update turns out around 100-150 yearly pending on what you sign up for.
My company pays for my inventor and solidsworks. But I don't use them that much.
For the 3d printing purpose I am still in the testing. I can see that it certainly matters from which console you generate the STL file. Honestly I would rather do without STL. Its a format that isn't really suitable for the printing we want. It cuts corners, so to say. I grew up with SmartCam... Now there was a machine control system. But yes, it's not free! Delcam used to be a company I admired. The shapes the software was capable of and the direct translation to machine language. Stunning! Then someone bought them out.
I guess my finish line should be, don't worry about software if you haven't been trained in using it. Second, there's a STL translator in all, that's what we should worry about in the first place.
Regards, Daniel