Ender 3 Cable Chain Brackets - Flipped for proper installation

thingiverse

User [pointybeard](https://www.thingiverse.com/pointybeard/designs) pointed out that the most popular cable chain on Thingiverse, as pictured, is useless at best and harmful at worst. The chain needs to be flipped in order to support the wires and prevent them from excessive bending. See pointybeard's visual aid here: https://www.dropbox.com/s/d5q0p4qwtkm24s3/drag_chain_orientation_example.jpg?dl=0 Most of the brackets can simply be flipped on installation, but the ones for the bed cables had to be adjusted to prevent bending. I also shifted the bed corner bracket to align correctly, as the original design did not line up with where the wires exit the bed. These pieces replace the two brackets in the original design. They are fully compatible with the original chain links--just snap them in upside down.