After finished first version I ran into two problems:

1. minute hand was not working at all
2.  hours got wrong offset after each turnaround

1. solution was just a parameter in firmware - took me some time and was just a bug in orginal firmware I got this from - now it works fine.

2. each diameter of each pulley is slightly different so it adds an error for each turnaround but the solution is also not difficult: add magnetic encoder at hour hand

For magnetic encoder I need little changes in CAD design. But using Fusion 360 is a huge mess. It is full of strange bugs. It is software with most bugs I know and my construction is not very difficult. A very frustrating experience! So I decided do give Shapr a try and this looks much better and is more intuitive. But I have to learn new concepts and I have to make whole CAD design in Shapr again. So this takes some time now but I hope to finish everything this week.