Cannot is the only negative form that contains not rather than -n't. Theoretically, since it is a single word, you can say why cannot you... without a problem. My theory is that modern English speakers don't want to put cannot before the subject because it contains not and sounds like can not.
grammaticality - Is it incorrect to say, "Why cannot....?" - English ...
1 There is no correct way to use "cannot help but." There are two traditional and synonymous idioms, "cannot but [do something]" and "cannot help [doing something]." Those who say "cannot help but" are conflating the two (in much the same some people conflate "irrespective" and "regardless" to create the nonsensical "irregardless").
Thingiverse contains more than 2.5 million things, and that number is growing every day. Check out all the incredible objects people have created, and get inspired to make your own!
Educational and Fun: The 3d printed wind turbine is ideal for teaching about renewable energy while building a cool, functional gadget. If you’re looking for cool things for 3D printing or want to create an impressive, sustainable project, this wind turbine design is a very good choice.
3D Printed Wind Turbine Design – STL Files. Cool things for 3D printing ...
I made this door hook especially to screw things on it and hang it onto a door. So it's not just a stupid hook but a great possibility to mount any part you want.Scale it in slicer to fit your door ;)Mit diesem Türhakenhalter inkl. Befestigungsloch könnt ihr alles anschrauben und dann an die Tür hängen, was ihr wollt. Läuft.