This broom holder can hold three brooms. I made it considering different brands and diameters. It should fit the most common sizes.

You can attach some velcro behind the plate and on the wall, or use the two holes at the side of the plate to screw it to the wall.

Instructions

Download the .stl file to print the broom holder as it is, or download the .skp file to modify it with Sketchup.