going to be running some deflection FEA to see if the linear rail alone will be stiff enough. currently, the entire X axis is about 1300 grams which is too much! the hotend assembly is only 230g.
deflection analysis shows abou 200um for 18N load on center. This is not acceptable. I will need to evaluate stiffening the 9mm rails or getting bigger rails.
It looks like added a square tube with thin cross-section is the way to go to stiffen this axis. Deflection at 4g acceleration was brought down to around 12um with much less weight than the original design. typical accelerations will likely be less than this.
The new Y axis moving mass is about 750 grams. I still need to run some more numbers to see if this will be light enough.
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