Igus rails, MX2 controller from Dynamic Perception to power the motor and to trigger the camera.The build quality isn't perfect, but it works pretty good and I think I spent about 400$, which is pretty cheap since it basicly does everything the more expensive dollies do, so I'm pretty happy with it :-)
I improved the dolly by exchanging the wooden base board with an aluminum one and I added some quick release plates to the bottom to quickly attach my 2 tripods.
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