invention

Do the make hovering drones were you can set at low height and it will stay? About twelve to twenty ft.? Please and thank you! P.S. I do understand that wind will play...

I have a 3D printer, I am fairly good with it and also 3D modeling with quality software. If you could have anything 3D printed, what would it be? Some things not to 3D print are things that are available for pennies, illegal things, designs that are too large (no cement blocks, or full size...