This knob is a replacement part for an old FiF toaster oven, for which I could not find any spare parts online anymore.
The knob is used to turn the oven-timer on/off.

If you print it like in the picture (finished print), the fill material can quite easily be removed with pliers. And when printed in that rotation, the part of the knob that will be on display might look nicer. (I printed it the other way around once and it also worked but the side that was on display was not as nice looking and the small indent on the button was completely filled with fill material that could not be removed.)
The small details (ridges in the knob-handle) got lost while printing but it still works fine and as a minor look-thing I left those as is.