While setting up our new kitchen, those little things for holding the shelves were missing, so printed some
They fit in a 5mm hole in the sidewall, and hold up nicely. Created a 2nd version with the possibility to add some screws, if that is needed.
Print them on the side for maximum strength, it does require a little support, but not a lot.. PLA or PETG should be ok.
The author marked this model as their own original creation.