Bed Hoist for a 3D Printer - Final Version

A system for Z-axis movement with hoist action. For instance for the D-Bot, Core_XY etc.

This is a replacement of Version 3 of my "Bed_Hoist_for_a_3DPrinter (D-Bot, Core_XY)", https://www.thingiverse.com/thing:2846764. Texts etc. are renewed.
Version 2 on https://www.thingiverse.com/thing:3427719.

In this version the wave from Version 2 has gone. I call it now "final" in stead of "version 3" because it is essentially the same, but without that new wave, which was caused by using the wrong hardware, mostly the bolts I used to function as axes. In the "Notes" I describe the several phases in between.
"Final" does not mean that there won't be any changes, preferably improvements, just that I now think that these changes would not be essentially different from this. But you never know ;-)

I define this "wave" as a recurring irregularity upwards in the print with a periodicity of for instance 2 mm, depending on what worm gear one uses.
Though it seems that by using a very costly