Here is a break down, curtsey of Patrick. We did not put any sizes down as those may vary depending on how wide or long you would like your dolly to be, but the guidelines should provide enough direction if you would like to build your own.
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I just love it when people use ordinary stuff to create new gear. Take a Yoyo for example. It’s built to roll and collect wire, reminds you of something? It reminded Marc Cocchio of a basic slider. And indeed a slider was build from a yoyo. Here are Marc’s rough guidelines on how to make a similar device.
As a maker, Marc used all kinds of scrap that was lying around and a bit of trial and error, so the tutorial below is set so you can build a similar (yet not an exact copy) of the slider.
The non-cheap portion of this project is the camera, remote and tripod. It’s important to have a tripod with an “arm” that can rotate such as my Giottos MT8361. Manfrotto makes a few cool ones, too.