Canon FD EF-M adapter

Canon FD EF-M adapter

Uses [Canon EF-M lens mount module V3](https://www.thingiverse.com/thing:4778993) and [Canon FD body-side mount module](https://www.thingiverse.com/thing:4892194) by brett stevens

This adapter is available in two models: a one piece model and a two piece model which, like [Empiricus' FD to EOS-M adapter](https://www.thingiverse.com/thing:4230182) will need three M2-0.4x1.2mm screws to assemble after sanding the pieces to correct height.

If you printer is very precise and prints flat surfaces on both top and bottom, use the once piece design. Use the variable 'mount_plane_adjust' to fine tune the height. The distance between the two parallel mount planes (The two largest flat ring-shapped planes on either side. *Not* the very top and bottom of the model) should be 21.34mm. On the Creality CR-10S I used I had to set `mount_plane_adjust= -0.36` to get the correct distance. If your printer, like mine, has trouble producing precise flat bottom surfaces ab