So a while ago I was looking for parts to improve my X5S z stability. Found the z-support system and bed lowering by simonvez, but wanted to make it even more supportive. So I added room for additional LM8UU bearings for both z rods. Also because creating holes that are perfectly sized for all printers is quite impossible, I made the holes use the system I saw @MakersMuse use on his printed 3D printer. So the bearing hole should adjust to the bearing and print quality.
Later Exerqtor released his version that regains some lost z-height so I incorporated that as well.
For extra z height there's 5mm thick blocks you can print if needed.
OpenSCAD source: https://github.com/spegelius/3DModels/blob/master/PrinterParts/Tronxy/z_support_remix.scad
Use supports for the middle overhangs. 2 or 3 perimeters should be enough.