Hi,
That looks cool. I would suggest a stiffener for the gantry.
Now the lead screw is serving that function. what I mean is when the gantry rails try to flex, they can pivot around the x rail, the only thing stopping this is the y lead screw. Which will be acting on your y lead screw bearings.
If you uses a piece of stock to join the two x carriages then the y rails may still flex, but not as much.
Also since your design is driving only one side of the x axis this stiffness will help keep the other side from binding or lagging.
Not a big deal for PCBs and light stuff but important for aluminum and harder materials.
Have Fun!
Dan |