Rod End Tool Bit

Basically just added a hex-shaped piece to the original to fit in 1/4" bit holder and smaller electric screwdrivers without and adjustable chuck.

Probably won't be as strong as the original but it worked when I tested it and they are fairly cheap to make extras of.

I personally printed it laying down flat (making sure the hex bit has a flat piece towards the bed) with supports.

It might be a snug fit to make it fit into the bit holder, I had to trim it a bit with a knife to make it fit properly, along with pushing it down against a table for the first use at least. But it also means that it won't fall out constantly unless it gets worn down.