I don't think I'll print any more of these. (unless he wants more). They just take way too long, and I was sweating the print failing the whole time. I also don't know how well they will hold up. I designed them thicker than most plastic parts, and the parts were oriented for the most possible strength in the printer, but time will tell.
I might come up with a more universal design, perhaps out of sheetmetal, with plastic only where the balls touch. That way the plastic can be oriented to print quickly, and would not be relied on for strength. It would screw to a flat wall, rather to the underside of an existing shelf as these do. And/or could be carried around like a tray and put on a table or shelf during a match. I doubt there would be much demand, but if a room owner said he wanted one for each table I'd probably do it.
That's all, enjoy
What a nerdy thing to do! I love it. If you wanted to and found easier ways of doing this. You could sell these to all the rooms in the US, where 1-pocket is played.