Can you please update the status for Assembly3
It is now available for testing as part of the Linux AppImage (and I believe DMG) in the current development version pre_0.19 from here: https://github.com/FreeCAD/FreeCAD/rele ... 4.AppImage. That means the Asm3 functions can be tested without the special build from realthunder.
Reference: https://forum.freecadweb.org/viewtopic. ... 68#p366768