Training wheel bracket

I went to go get my older daughter's bike refitted with the original training wheels for my younger daughter, and one of the plastic bracket that keeps the training wheels from scuffing the bike was broken. My first thought was : Where in the world can I gone of these? My second thought was: Wait, I have a 3D printer!!

(This is for a Raleigh bicycle)

It took a few tries to get all of the dimensions right. It prints faster on its side, but I want the weakest part to be where it has meta