Any super easy to use application for 3D modelling?

Even AutoCAD 123 is considered too difficult for the my target audience. Maybe something like users of Paint to draw on an image & an application converts it into 3D with depth adjustments?
Comments
You might try the terms in a search engine to see what pops up.
It's fully funcitonal, but you're limited to 25 saves and no clipboard copies.
The infinite-save version is not free, but I've gladly purchased it, along with two upgrades, and found it to be very intuitive and easy to use. It's my go-to program for 3D CAD.
-Phil
Saw "Sketchup" also mentioned in another thread. Seems good but too extensive & not free. Basically, I'm looking to see if I'm able to provide an easy extension of allowing end users to add a little customization to an image of my product & if applicable, incorporate their design to the final 3D print of their order. Sounds easy enough but reality is far from it......
I personally am using Rhino3D for all my designing needs too.
The cubify draw apps looks very interesting & easy enough for my potential users. I'll have to try later.
Thanks.