I made a bunch of bolas for a ladder golf game - so I had to drill many used golf balls. I designed and printed this little jig which goes into a small machine vise fixed on the drill press' table.
I used a centering jig like this to find the perfect centre of the golf balls:
https://www.printables.com/model/259701-drill-press-center-finder
I printed the jig from PLA - but PETG would have been the better choice because there's actually some visible wear after drilling 60 balls and not holding onto some of them perfectly tight 😁
The author marked this model as their own original creation.