Ender 5+ Stop the squeak

Plagued by squeaky Z Lead screws on the Ender 5+, tried all the remedies found online, lubrication etc... Still squeaky. I noticed when the bed was moving to the lower positions and a lot of lead screw was above the lead screw nuts, both of the lead screws showed visible runout at the top of the threads, a distinct "wobble" at the unsupported lead screw ends. I considered this may be related to the squeak as the squeak only occurs when the bed is toward the top of the lead screws. Regardless I believe that supporting the lead screws and keeping them centered at the top of the frame could only improve the printer.

I designed the supports so that they would accept a 28mm OD bearing with a 12mm ID, I had to print some inserts to adapt the 12mm ID to 8mm ID to accept the 8mm OD lead screw.

28mm OD bearings are a nice interference fit into the supports and the inserts are also a nice interference fit into the bearings 12mm ID. The design could be adapted to accept 22mm OD x 8mm ID sta