CR-10 Dual Z timing belt sync brackets v2

Update: I found that this mod still causes the top of the z-screw to bind. I have designed a new one from scratch that uses skateboard bearings and has plenty of clearance to prevent binding here: https://www.thingiverse.com/thing:3532138

This is a remix of the Dual Z Timing Belt Sync Bracket by hoegge. I changed the hole that takes the bearing so that it is elongated to allow for the bearing to move perpendicular to the z extrusion. This allows for play in the spacing between the z extr