I redesigned this Y-axis motor mount after I realized how bad my Y-axis backlash was. This new mount has an extended front component that allows you to place an additional two screws for support. Then I created a new rear component that adds stability and support by attaching to the front component using an M5 * 16mm screw and nut.
2018/08/19 - Added an outside mount option.
2019/04/20 - Replaced the rear brace option with one that actually works! Thanks to 8Atena's remix for pointing it out.