I printed this in PVB so I could fuse the 2 pieces together, but I'm pretty sure super glue does the job just fine if you wanted to use PLA or PETG. It's been holding anything I put in there without issue. There is also slightly more volume for storage than the original shelf.
Disclaimer: I printed this on a heavily modded (sarcastic → ) wonderous Ender 3v3 SE. So that means the parts scaled a little differently. So make sure when you print out the first half that it fits in your fridge the right way.
The author marked this model as their own original creation.