I made this yesterday.
It printed great, I added some extra infill and slowed it a bit down, just to be sure.
But, elas the fitting of the pins is to close, one side got in ok, with a bit wiggling, the other side was way more difficult, and resulted in breaking all six pins in one go. I wonder why it is so tight, since the weight and the length of the poles would keep the thing in place anyway. So 2 adjustment could be made, one is make the pins a bit thinner, by a 0.5mm or so, and maybe, in case the pins are broken, some screw holes. Or even altogether only the screwholes in the horizontal plate and leave the vertical plate out all together. That way we could use it on all kind of wooden or metal racks, or on the wide part of the IVAR rack, and make it a faster print.
Thank you so much for this! It's great and cheap solution instead of official plate.