Perhaps it is because it is one of the first models -- A. But themachine can drive you crazy. Do a two hour carve, perfect. Run the same pattern again and whn I get to the point of changing to a router bit, the machine moves to check the depth and I get an X axis stall. Abort. That's the part that drives me up a wall. I change the pattern to remove all te patterns that have been carved, and without ever having removed the board, start again and of course the pattern is off center -- no longer conguent. Are their any workarounds when you runinto situations olike this where you don't want to lose what you have carved thus far but have to recover from a machine error?