I have extended the length of this object (linked below) to give more shelf space. Print with supports.

This is a remix of this https://www.thingiverse.com/thing:1549065

This is a replacement shelf for a Frigidaire refrigerator shelf.
Model LFHT2117NF6.

This should also work on Magic Chef, Whirlpool, and whatever else is in the family that uses this style of shelf..
You can look up my model number on the website and get the part number for the shelves. You can then look up your model and see if the part number is the same..
I have included pictures of what the door looks like without the shelf in order to help. If yours looks like mine it will probably work.

All 3 of my shelves broke in less than a year so I came up with this system. It seems to work just fine.

The area that requires support is not visible when assembled so it is not bad to clean up.