A new hope: Epoxy granite and steel.

[hardenum]

Why the big cutout for the motor? Looks like a big waste of material and it certainly won't help with the stiffness of the fixed ballscrew bearing block.

For the gantry I would make a much bigger section, ideally square. EG is not very stiff at about 30 GPa.

Actually that's because I wanted to make a universal casting for the belt assembly, and that meant all axes would have the same belt config, belt length etc. like this: https://i.imgur.com/5XeRLwY.png

The x_axis actually sits on a structural steel plate that provides the necessary stiffness and connects the x_axis with the supports.