Hi there,
Got that Sweet Seeed Green PLA+ the other day and my , my the Green is anything but mean…
Printed a C6 socket and tested it with a Nrf52840 also. 8 pogo’s too.
Lowered the back with the wording to accommodate the antenna.
Enjoy and The G.gode is in the ZIP.
GL 
PJ 
Enjoy
XiAO_C6_Socket.zip (198.0 KB)
I also use this .90 hand-drill and bit to dress the small holes so the fit of header pins is loose or tight.
YMMV
That Sexy Seeed Green…
Should be on the website for sale.