Yep, that's a home-made, motorised dolly :) The man has this to say about it:
This is my first go at making a slider. It is built from 2 shelving rods, and a small moving trolley from Mitre10. It is motorized by an old BBQ rotisserie motor and pulled along by nylon fishing line. Its just over 2m long, and this version was about 35cm wide.
I have since moved away from using the trolley ,and built a small slider, also reducing its width to about 15cm. with this motor it takes only 30 min to slide along the 2m rail. my next iteration will have a smoother geared motor, (1 or 2 RPM) enabling a longer adjustable slide time and will eventually have a pulley system in place to enable forward and reverse motion.
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