It was an excellent opportunity and exercise to apply all the design and printing skills I'd been building up over the past while. I started by taking some measurements from the broken shelf bracket and the tab on the door that held the shelf in place, and then came up with a better stronger bracket which I drew out in Sketchup.
test print of new bracket. Excuse the colour! I've no white plastic!
There's the new bracket attached to the fridge shelf. you can see what remains of the original skinny piece that broke away, and the epoxy from previous repair attempts.
I considered a number of ways to attach the new bracket but settled on three small pop-rivets.