I can't find the part I'd downloaded from Thingiverse, but here's the relevant search: www.thingiverse.com/search?q=vw+center+cap&sort=relevant
The one I snagged (actually the second) correct for the Lemmerz wheels I have on the car now I printed out a few times and determined 104% scaling gave the best fit. I've got some Bronze filled PLA from Proto Pasta, but my printer is down until I figure out how to R&R the Bowden tube. The instruction shows brass fittings where there're no brass fittings. 
I've got a spool of PETG I haven't tried yet. Proto Pasta has heat-treatable HTPLA www.proto-pasta.com/collections/all/feature_heat-treatable
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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