Aluminium FEA optimalized CNC router

[PotatoMill]

Given that the additional cost and effort is low I'd add the side supports anyway as there may be a significant reduction in resonance under circumstances for which you have not calculated.

Indeed, that's why I will probably build them anyway, but it can also be easily added later. The only minus is the added with, if I can get it trough a door on wheels whitout removing the gantry and tipping it on the side it would be nice. Else than that it is only positive with the added rigidity for unforseen deflections. Hovewer the base is already more than strong enough, it's the torsion on the gantry that is the weak point.