I was having the problem of my dash speaker grill popping out every time i closed my frunk. The inserts that go onto the threaded studs for the grill and insert into the holes in the dash had all disintegrated. So I whipped up a new fastener to thread onto the studs and printed it out of PETG HF on my bambu P1s. They work great, but would likely be even better printed in a TPU.
Here is the link to the file on Onshape
https://cad.onshape.com/documents/3bbb7e9bfdb5062daa6f45e9/w/770d5c092f6ac423e9a1ee3f/e/5130c7ddf81b6929d163395d