I have an old dresser. The drawers had a nylon slide on the back that grabbed a single rail under the cabinet to stop the drawers from falling out. Unfortunately they broke, so I made this to fix them.

One imagines that all kinds of weird cabinet rails exist, so here's the link to my project in OnShape: https://cad.onshape.com/documents/0ae8a18c7cb039613660e769/w/e0f22dd4e85d4ec8e3a027a6/e/ebfe27a5a470329b5332ff60?renderMode=0&uiState=6712a8b14695cf68beafb1df

When printing, make sure you orient the part with one of the C faces against the print bed for better durability.