Newtek Lightwave 3D pretty well, but I still struggle with UV mapping. (The process of taking a flat artwork and wrapping it around a 3-D object).
It's fine on my paper model kits because it's built into the process, you have to flatten everything out anyway when making the cut out pattern. Also, the paper kit has to me constructed of simple shapes to make it possible for the user to put together. Although the bean-shaped seat on the wheeliebug looks like a simple shape for the purposes of UV-mapping it's a foul group of compound curves that totally resist accurate wrapping of a 2-D image. Like trying to wrap an orange in a sheet of paper you are going get folds and creases and parts of the image disappearing. All of his is made worse by having a number of straight lines that need to seamlessly cross the awkward curved areas.
You are probably wondering why professionalism could possibly be associated with those simple wheelybugs pictured above, you must be thinking, "What's he going on about? I could easily do that". If you are a 3-D design professional, yes, you probably could.
Wheelybugs are brilliant and you can buy them along with lots of other marvellous wooden toys from Little Fish Toys