Micro Tutorial FreeCAD 0.17/0.18 create one 3D STL from several Solids

Here, as an answer to a Forum Post i show how the MESH Design Workbench can be used to create on SOLID MESH for 3D Printing out of several Objects. 2 separate dsesign where loaded into a2Plus Assembly WB and then i join them at one point , i crete 2 Meshes and MERGE them .Finally i show the result in CraftWare Slicer