Tablet holder arm - replacement ball joint

I designed a replacement ball joint section to fit a generic phone / tablet holder arm from eBay, after the original one broke. Sharing in case anyone else has this same issue.

Example listing from eBay: https://www.ebay.com.au/itm/333861217908


Prints best in the original vertical orientation, or you can print each half on it's back with supports so the inner parts come out cleaner.