Quote Originally Posted by jcb121 View Post
Thoughts and constructive criticism welcome.
I like the triangles, you get a lot of strength from a triangle.

Can I suggest 2 small changes.

The X axis rails have a lot more vertical separation than there is separation on the ball bushings. This introduces an awkward turning force on the nut which the bushings are poorly placed to resist. Suggest you lower the top rail and screw somewhat. Allow the Z rails to overhang at the top you are only going up there for tool changes, keep the strength at the bottom where you need it.

Bolt the vertical risers to the sides of the Y axis aluminium sections. Connect the diagonal braces to the vertical risers with a lap joint not a mitre. Using an offcut from the vertical riser as packing, lap joint the braces to the aluminium sections. Maximise the rigidity the diagonals have to offer.

Incidentally, 1/2" thick aluminium bar is a lot easier to find than 10mm.