I'm in the midst of building a Darwin and one of the things I noticed is that the Z axis was very stiff. After playing around with this and that, I finally removed the spring and upper nut from the anti-backlash mechanism. As far as I can tell, the weight of the bed is enough to prevent backlash. I'll probably put the upper nut back in, just to give it a bit more support.
My view on it is that I won't get backlash unless I lower the bed fast enough to counteract the weight of the bed. What do you think? Is there a compelling reason to keep the spring in?
