f295 member MarkB has instructions for making a sweet-looking sliding bar mount for stereo/3D photography. He writes:
The slide bar allows you to take 2 sequential, side-by-side photos of the same scene, rather than simultaneously exposing 2 images.
This took 2 or 3 hours to put together. Mainly I’ll just show photos below with a few tips, rather than step-by-step instructions. It’s pretty easy and self-explanatory.
Total cost to me was about $2 for a package of threaded inserts. I had all the other materials on hand (scraps from earlier projects). If you had to buy all the materials you could still do it for under $10…
Check it out in the f295 DIY Photography Forum, includes photos