I have a well-used and admittedly cheap camera tripod that I use for all kinds of photography, BUT I HAVE ONLY ONE MOUNTING PLATE.- an easy problem to solve through the magic of 3D printing.
Uses a 1/4- 20 screw for the camera attachment and Includes a nut trap for an adjustable/removable indexing pin - uses a 6-32 nut and slotted set screw.
Fits the tripod snugly. Ambico / Velbon / Amazon house brand and possibly other inexpensive tripods. 45mm / 1-3/4 inches square dovetail design.
Gonna need a couple more...
UPDATE: I printed a couple more. I found that the base plate is too large to fit on the PINHE4D http://www.thingiverse.com/thing:132517 35mm 3Dprinted pinhole camera without a fiddly spacer. So, I modified the design to taper to a smaller base for tight applications. Find the alternate design in the downloads section.
If there's any interest, I will make a parameterized version for similar mounts.
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I printed these with 3 perimeters and 50% infill for strength. You don't want your mount to break and launch your camera into a gravitationally-powered collision course with Terra Firma, do you?
NOTE 1.4 inch bolts come in discreet steps and your camera's tripod mount might be shallower than the exposed length of your bolt thread. Thus, I have included spacers in 1 and 2 mm thicknesses for your photographic pleasure, with 25 and 35 mm diameters. Just like the tripod mounts, you'll want to chase the center hole with a 1/4 inch or 6mm drill bit. Printing a spacer is probably quicker than running to the hardware store for some..