instead of perfectly straight threaded rod, i think it would be helpful to have smooth rod to guide the movement of each arm and threaded rod to drive the movement, as seen on the prusa i3. this way, the threaded rod neednt be perfectly straight, allowing it to be purchased from ahardware like home depot here in america. their larger diameter smooth rods are also very straight and run $5-$6. their threaded rod is significantly cheaper though they are not metric, their metric values/parameters can be calculated or looked up.
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