Replacement wheel for a Kenmore Whispertone 12.0 Vacuum.
The replacement wheel with the original rubber tread
I wasn't able to print a replacement that could withstand the stress of being clipped onto the vacuum. You might be more successful with different slicing settings or printing with something other than ABS, like a more solid rubbery plastic.
See http://www.chrisfinke.com/2015/01/05/3d-printed-vacuum-cleaner-wheel-failure for more pictures and details.