Tronxy X5S - Anti Z wobble

My "Anti Z Wobble" for Tronxy X5S.
This requires:

- four 608ZZ bearing
- eight M3 screw (35mm)
- four M4 screw
- four 15x1mm washer (internal hole: 4 or 5 mm)
- two "T8 collar" to not put the weight of the bed on the motors

Optional: another collar can also be installed under the bearing in the lower support, but it is not necessary, the one above is sufficient.
The system works very well if all the bars are well straight and perfectly aligned with the frame.
The "up_guide.stl" allo