So with the smooth rods the way I am getting better precision is by locking the rods down better than the hole through the wood or acrylic that gets loos and lets the rods themselves have freeplay. The way I am fighting this on my reworks is by making pieces that are a tight fit on the smooth rods have a bit of thickness to them and screw down to multiple points on the frame. Here is one of the Z rod braces I made for the top of the frame.. And here is the lower.. And all 4 together.. This will limit or prevent any type of Z banding issues from happening. And for a control solution I am using an SKR Pro 1.1 with an MKS external mosfet to drive the bed and a BIQU mosfet to drive the extruder. The Power supply is 24v 500watts..