Bed_Hoist_for_a_3D_Printer_ (D-Bot, Core_XY)_-_Version_2

A system for Z-axis movement with hoist action.
This is Version 2 of my "Bed_Hoist_for_a_3D_Printer_ (D-Bot, Core_XY)", https://www.thingiverse.com/thing:2846764.
There is now a final version:
https://www.thingiverse.com/thing:3732450,
where I battled the wave from this version.

Difference: one 10mm belt, simpler parts.

For a time I left out one hoist and belt in the first version and that worked ok, even somewhat better than with 2 belts.
So if you already have made version 1, perh