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Here is a Tilt-Shift Adapter that can be configured to attach Canon EF or FD lenses to an EOS-M camera. Old FD lenses will allow to select the f-stop. EF lenses will have wide open aperture and the adapter allows for detailed control of depth of field for miniature style photography. Always wanted one of these and also I was curious to explore whether one can print in the required precision and create a functional adapter.
Shift and tilt can be set between plus/minus 10mm and 10 degree, respectively. I use it with the EF 24 mm L 1,4 II or FD 24 2.8.
Integrated a lock for EF lenses that uses a spring from a pen and the adapter will lock also on the EOS-M. Tighten the rotation stop to mount or remove the adapter.
To mount an FD lens first insert the lens with the red marker 45 degree to the right of the marker on the adapter, then turn left until the red marker lines up with marker on the adapter, press the lens down and turn right until the lens locks. This will engage the aperture lever. Even older Breech lock FD lenses will also fit. Those can be set to manual aperture operation directly by pushing the lever counter clock wise before mounting on the adapter.