Hello Scott. my job is building Road cases for the music industry. we as sad as it is to have a practical dual 2 cnc router. we have faced every problem on this thread. up grades so far. installed steppers. machined x axis 80/20 gantry top and bottom extrusions square. installed optical limit stops. now the latest issue is we also have a y axis gantry shaft failure. would you be so kind as clue me in on what material you used for your new shaft. upgraded bearing and bearing retainers you designed.

thank you
roadcaseman