Excalibur Umbra Lego head
thingiverse
This should fit a regular size minifig body perfectly. If it's too tight, carve out part of the neck hole with a knife to get a smooth fit. I highly recommend printing this on a Resin printer for optimal results. While I've printed it on an FDM before and gotten decent quality, it still needs a significant amount of post-processing cleanup to look its best.
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