About this 3D model

Two versions, one with plate on bottom to aid printing (just cut the plate out) and one without. I've added in a little flange to "grab" the aperture adjustment on the Kiev lenses so you can twist the assembly (slightly!) and open/close F stops. Depending on your plastic and printer may require some trimming with a blade. Note the orientation of the small hole for your camera's lens release button/shaft. Photos show it on my OM-D.