I designed this for my DeWalt 20v weed wacker. not sure if it will fit others but its about 4" wide and the loop comes out about 3" the loops thickness is about 1/2". i printed with PLA and basic settings with support and the side that mounts to the wall face down. the center circle serves no purpose but to save on some filament.

i only used 20% infill and its strong enough to hold the wacker plus me pulling down on it.