My new 6040 improvement plan.

[PaisleyPCdoctor]

The first and easiest (and free) change is to the Z-axis assembly.
On this model, a 35mm spacer block has been added on top of the top bearing, increasing the Z axis length/travel by 35mm.

The way it's been built, I can very easily remove it and instead, mount it under the bottom bearing. The entire Z axis will be moved 35mm closer to the bed, but I can recover exactly that much by raising my spindle in the mount. I couldn't do that before as my tools wouldn't reach.

This will shorten the length of the "see-saw" motion, so in effect, the spindle tool will not move as far.

I'll measure deflection properly both before and after the modification.
Here a picture of the spindle and the 35mm spacer block.