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about halfway down,

        // Mounting holes on the base.
        translate(legacy_mount?[-3.4,0,-1]:[0,0,0])
        for (mount=[0:1])
        {
            translate([-filament_feed_hole_offset+25*((mount

&
lt;1)?1:-1),

^^^ the 25((mount
&
lt;1)?1:-1) there. hole spacing is 2
25 = 50mm.