As I have started using my Ox (Cebu) more, I've noticed some flex in the z axis. At first I thought it was the x axis beams, and was planning to bolt them together. However, it seems like the x axis beams are fairly stable, and the flex is coming from the z axis components themselves. The z axis extrusion with motor on top can move back a bit without moving the x axis beams. The carriage wheels on the z axis assembly are quite tight against the x axis.
It looks like the flex is coming...
Z axis rigidity
It looks like the flex is coming...
Z axis rigidity