Fixed Gantry Design - Input Appreciated.

[Electroconducive]

Hi, if you're after maximum rigidity I'd go for the twin ballscrew design. If you're not limited by space then put the ballscrews on the outside of the frame and drive with a single stepper and belt like you say. There'll be no problems squaring it with simple tools and once squared it will stay that way.

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Thanks, Putting the ballscrews either side will also let me shave 10mm off the overhang. Weird Steel Z design it is then.