My daughter's wet brush handle broke when it fell from countertop level to the floor.

3D printing to the rescue!!

Disclosures:
This model is not perfect, there is slight waviness to the outer curve of the brush that I can feel with my fingers but are only visible on close visual inspection.
This model also omits the curves of the back part of the brush, allowing an easier print, less filament. In spite of this, I feel it fits just as well in my hand.