The accuracy is greatly improved! The X axis used to have some play in it but now it is right on the money.
The fan power pin on the laser controller is backwards from all of the other connectors. You will need 5-9 volts on the analog connector to turn the laser on. The blue trimmer sets the laser power.
How much has the continuously supported rails improved the CNC? Check out the next two pictures for before and after accuracy. Pay particular attention to the right side of the R and D.
After upgrade result: