Been busy with other stuff, but did manage to get new Y-axis parts printed using PETG:

https://www.dropbox.com/s/19u798xw8v...17.05.jpg?dl=0
https://www.dropbox.com/s/cewjcxp2um...17.17.jpg?dl=0
https://www.dropbox.com/s/poj4jaz3t9...17.28.jpg?dl=0

Also designed and printed a jig for aligning the rack parts. Works fine and it's all printed parts:
https://www.dropbox.com/s/w6h7bz2maa...17.44.jpg?dl=0
https://www.dropbox.com/s/lxqlbini98...17.51.jpg?dl=0
https://www.dropbox.com/s/1aovt26rcl...17.58.jpg?dl=0

I used soldering iron to fuse the parts together so the parts don't move in use.
The new racks seems to move more smoothly. I printed few rose stems and the results are quite good:
https://www.dropbox.com/s/a3qu25wn11...00.31.jpg?dl=0
https://www.dropbox.com/s/dlziq1l9xr...00.36.jpg?dl=0
https://www.dropbox.com/s/hmpcpuea74...00.49.jpg?dl=0
https://www.dropbox.com/s/5vt00vjxkw...00.58.jpg?dl=0

There were few skipped steps on the other print, I loosened the Y-mount a bit and set stepper amps bit higher and seems to be working fine now.