MagBall Arms + Balls - 360mm
Six carefully assembled and matched Magnetic Ball Arms are 360mm long +/- .3mm measured from the center of one ball to the center of another. Within a given set, the arms are marked with their lengths and are guaranteed to match one another within 0.10mm (100µm). Also included are 12 Ball Studs which have standard 3/8" diameter balls and 3mm diameter, 10mm long shanks.
The magnets typically exert at least 1000g (1kg) of force on the balls.
Effector and carriage STLs are on GitHub/UltiBots/K250VS.
Rail carriage is available thanks to AdrianW http://www.thingiverse.com/thing:1264254. They have 45mm ball spacing and are untested by UltiBots.
NOTE: These arms are made by the MagBall guru Haydn. And picture needs updating.
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All prices are in USD.