Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2819503.
EDIT: Version 3.1 has replaced the original. This is a better design with 2 points for the zip ties which stop it from wiggling.
This is an add-on for the Anet E12 to support the heat bed cable. It removes the stress of the cable moving around from connector. This unit screws on to the where the bearing block is mounted. It should be noted that I used longer screws for this (M4x12) as it did not feel like the factory screws grabbed enough threads.
This was designed with a slot for a 4" zip tie to go through on the end and secure the cable.
I also made it go off at a 45 degree angle to keep the cable away from the Y limit switch.
NOTE: When I sliced this in Slic3r PE, it sliced it with the rib that runs the length on top of a solid layer. This delaminated on me when I flexed it. Cura printed it open and it seems better. So your mileage may vary.