I am going to be building a larger laser cutter gantry and am not sure what size of linear shafts to get to support the Y gantry.

The gantry is only going to have the laser head, nozzle, and some wiring to a solenoid so very little weight, but it will be 900mm long. I don't want there to be any wobble or oscilations.

There is quite a price jump from 12mm to 16mm to 25mm so what size do you guys think would be good enough?

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