This was made to get a string thru the gasket of a car firewall so that the string could be tied to a wire and brought through.

I printed it in PLA and sanded it down to a point so that it could pierce the rubber gasket in my 4Runner firewall, and it worked well. You might need to poke a hole with a metal pin or pick to get it started so that this plastic piece can follow through with it. Once you've created a hole, it is hollow to allow you to pass a small string through so that you can then tie it to the wire you need to pull back through, or if the wire is small enough to fit through the hole then you can pass that through as well.

You can mess with the scaling of it in your slicer so that it fits your specifications.

It functions similar to this tool but in plastic flavor:

https://www.amazon.com/Performance-Tool-W2935-Insertion-Piercing/dp/B073WZCL8Q/ref=sr_1_7?crid=3H7MKSC8QLFP2&keywords=Car+Wire+Insertion+Tool&qid=1682355088&sprefix=car+wire+insertion+tool%2Caps%2C146&sr=8-7