We are currently in the process of revising our CNC design since the Y/Z axis was eating its rails over time due to slight alignment issues. We decided to upgrade the bearings in general to avoid the problem in the future. The x-axis seems to be working fine, so we are going to leave it alone for now. The revision includes CNC cut pieces instead of hand cut pieces (using table saws and drill presses). We also did a major upgrade to the bearings and went with ACME-type lead screws to minimize backlash and improve accuracy. We updated the stepper couplings to the lead screws to make future maintenance easier. The redesign is expected to be complete within the month.