Here’s a trim panel fastener in 3d print file. I think this one is only fitted on Mk3.5, early ones are a different panel.
Item 19 in the diagram;
First version we did with the domed head but didn’t print to well with the support underneath it. So we made it flat and works lovely. Left is original, middle version 1, right version 2 with flat head.
The thread is not an exact match but it functions perfectly;
Download here, .3mf in a zipped folder;
6815336 Interior Trim Panel Fastener 3D Print File – Footwell Area
Securing pin for Fiesta Mk3.5 Interior sill panel trim. (Front footwell area)
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