After several iterations and much testing, I came upon this design. The deep eyepiece clamps allow for focus adjustment, as the optimal distance from a phone camera to a microscope eyepiece can vary. The disconnected eyepiece clamps allow for adjustment to fit a wide range of eyepiece diameters. Lastly, the sliding phone supports allow the adapter to fit a broad range of phones (pictured is a Nexus 4, though larger or smaller phones also fit).
Universal Camera Phone/Microscope Adapter
Source: Markerbot Thingiverse
Image credists: ggoss
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