Print standing up (as imported). No supports.
Also, this model will hold your mop perfectly!
** Unfortunately MakerWorld doesn't allow me to link you to my commercial printing license, I do have one however as I am a professional. If anyone is interested in contacting me in regards to the license or about the designs themselves you can find me @Snail on Printables. That is mainly where I am active, comments on my makerworld profile will likely go unanswered.