As I no longer have XYZ Printing Da Vinci 1.0A printer, I'd like to share my design of anti Z-wobble bracket. I didn't have a chance to test it fully.
The idea is that the wobble of Z axis are compensated by the springy spiral arms of the bracket and so it should eliminate horizontal lines on the print walls.
The bracket should be printed with some slightly elastic material, like PETG. Maybe stiffer TPU could work as well.
Maybe someone would like to finalize my work and share it with community once ready. All sources are available as Fusion 360 archive. If required I can provide other package format.
Check out my other unfinished design for Da Vinci printer: