For all its warts, the printer DID manage to fix our drawer.
Nope. that had completely occurred to me. My only recourse was that I could make the brackets thick enough to take the screws I had, keeping them from emerging at the front.
That’s my story and I’m sticking to it.
@D_Baynes define better, my definition is not having to put pants on.
Plus, maybe that bracket works best if it’s 1.125" on one leg and 0.875" on another. Try finding that in a hardware store.
If your prints have warts, maybe you should increase your retraction rate. 
(I’m just kidding… I was recently fixing “pimples” on my prints, so that hint is fresh in my mind)
+D Baynes: Metal brackets are good, but if you want to use the holes that have already been drilled out, custom-printed brackets are the best… so you’re not drilling your mdf drawers into Swiss cheese (and eventually dust).
+Mike Miller: If you need to print ver 1.2 in the future (in case another drawer fails), may I suggest:
1: Another anchor point closer to the corner of the bracket, and
2: Maybe sloping the bottom or top edge so that items don’t get caught on it as easily? 
Possibly. I’m just relaying my experience of repairing a K-Mart dresser with metal brackets. I did it before I had a 3d printer, and I had to drill out holes close to previously-drilled holes, and the MDF is falling apart.
Also, that comment of “sticking out” was not about metal brackets. It was a suggestion for their next design. However I agree with you… metal brackets would sit flush on that surface.
I was hoping the screws would pull the face in, I could drill another hole closer to the corner, but I think I’ll just leave it alone for now. I figured I was on the hook for a new drawer anyway, it couldn’t hurt to try. Some slight delamination of the print… Needed to widen the holes a little.