A friend of mine just moved and is pulling stuff out of storage into her new home. One of her Ikea tables was missing a foot, and she was really bummed about it. So, I took a table leg, and one of the three remaining feet home with me. I do not know the year/model/etc of the Ikea table as it's been in storage for some time, but some Googling leads me to believe it's for an older Ikea Adlis table leg--their more recent/modern legs look like they have a different foot.

After about an hour with calipers and Fusion 360, I was able to create a replacement! The internals aren't 100% the same, but are dimensionally accurate, and the only visible bit is identical.

It fit like a glove! So satisfying!