FreeCAD: Assembly Drawings

Assembly Drawings are FreeCAD drawings composed of two or more FreeCAD drawings.
For example: Suppose you have drawn two gears, each in its own .FCstd drawing file,
and you want to put them into a single drawing to better visualize how they'll fit together.
The Procedure:
- open a new drawing
  File > Merge Project ...
  browse to desired FC drawing file, and double-click to merge
  rename inserted element in model tree for easy id
  save-as drawing file
- Add next element:
  File > Merge project ...
  browse to next element to be included in the assembly
  double-click to merge
  rename for easy id
- re-position new element:
  hover over the element listing that you want to move in model tree
  right click to show context menu
  left-click Transform
  in Translation increment field,
  enter how far you want to move it
  click and hold axis arrow tip
  drag until it clicks into place
- repeat for movement in other directions as desired
- Similarly, click-hold-drag the round icons for rotations
- click OK
Merge into single object:
- To make a printable (single) stl file:
  select original body
  Mesh Design -> Meshes -> Create Mesh from shape
  select merged project
  Mesh Design -> Meshes -> Create Mesh from shape
  
  hold shift and select all mesh objects
  Meshes -> Merge
  Export the new mesh that is created

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