printrbot open cable chain Free 3D print model

I just finished designing and building
thingiverse.com/thing:39789
The pain with enclosed cable chains is you can't easily rewire them or replace a link.
Here I've made a set with a U section instead of enclosed. It is also easier to clip these open links together than the closed ones.

Extras.
I've added some "45-x" part which can bend back 45 degrees as well as forwards.

Likewise the "22-x" is 22.5 degrees and "9-x" is 9 degrees