My new and improved cable chain. I added some material to the inside of the the female tab to stiffen it up a little. This took the ID from 10mm to 9mm. And I made the male protuberance a tiny bit longer so it presses harder. The whole thing is just a little tighter now. And I added a slot in 6 of the links for a small wire tie.

Still not as good as an Igus chain, but it's getting there.

There are 6 rows of 6 open cable chain links, 9mm inside diameter.
I added a brim, 0.25mm thick strip connecting each link together to prevent them from walking around the print bed. I also have 2 ends on the side.