I'm building a steel gantry router and I wanted to go with 200x100 steel tube but was given the advice to go with 200x200 because you're not just fighting gravity but cutting forces as well (and torsional forces when the z axis is lowered down)...

I'm using 250x250x10mm steel tubing for the gantry at 1300mm lenght to get the stifness I need.

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