General Motors screw anchor nut.

thingiverse

I was replacing a worn-out dash pad on my 1982 GMC truck when I realized that one of the oval inserts for the four screws holding the passenger side was missing altogether. I measured the hole carefully and swiftly came up with this design to fit it perfectly. I printed it out using Excelvan clear PLA at 0.3mm layer thickness and 50% infill density, and it securely holds the screw in place. New ones are only ninety-five cents apiece, but then there's shipping costs to consider, and I needed a solution right away, not in a few days' time.