K8200 / 3Drag 2nd z-axis drivetrain
thingiverse
Upgrade your K8200/3drag with an additional leadscrew! This version offers flexibility in varying belt lengths. Simple printed parts make it easy to assemble. The second axis nut follower isn't included, but you can adapt it for other belt types. Inspired by donboy's work (http://www.thingiverse.com/thing:222245). Print in PLA with 0.3mm layers using parts like a long primary mount, two secondary mounts, and end supports from here (http://www.thingiverse.com/thing:175137). Longer belts may need extra pulleys and short primary mounts for clearance. Secure GT2 pulleys with electrician's tape and file down Robotdigg pulley posts before polishing with 600 grit sandpaper. Oil the pulley posts to ease movement. You'll need M8 stainless threaded rod, nuts, washers, M5 bolts, washers, M6 nuts, washers, plus PTFE oil and extra RobotDigg parts like GT2 pulleys and bearings.
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