This is a slight remix of a great design.

I didn't mean for this to be a work in progress but I was never really 100% happy with it. Now I am. I have a 10mm hex on one of the legs. I have 2 triangle keys. I ran across a triangle key that was a little smaller than the one I know so I made a smaller triangle and added it. And of course the round key with the 2 tabs on the sides. I have a 1/4” hex on the bottom and a 1/4” square hole on the top. This key may not be for everyone, but it works for me.

I deleted all the other stl files from this thing because I think they must have gotten corrupted or something, they would not display properly.

I am adding 2 stl files, but both are of the same key. uni-key-5-brim uni-key-5 One has brims and printer helpers and the other is just the key, no print helpers – you have to add your own. Printed in ABS .2 layer 50% infill