Z wobbling fixes poll

I had to replace the z lead screw as it was too bent to make reliable prints.  I also use Kendall's Jam nut solution with a nut hugger to hold it in place.  I probably ought to get a spring in there to make sure it never binds.

1) Firmware/software compensation
   2) Additional printed weight holder (nickels) mounted to outboard (front) of stage
        - theory is similar to preload...decreased slop between z-axis threads  due to cantilevered load.
        - also adds a dampening effect for stage movement. 
   3) Printed spring loaded stage stabilizers against outboard (front) frames
        - stage is compliantly tied to frames and slightly biased downward by printed plastic spring leafs
        - in combination with the additional weight above, the stage movement stays tied to the frames.
   4) Shimmed extruder motor to stabilize (from front to back) and removed all adj slack I could find in drives.

I also initially added a counterweight system (pulleys, chains, more nickels, steampunk style) to pull up on the stage mount at the z-axis screw. The theory was to bias all of the tolerances out of the z-axis drive from the frame all the way up. It initially gave good results, but, when the OB weight holder was added, it's interaction tended to add noise to the travel. I experimented and decided the OB weight was the simpler and more reliable effect, so have unloaded the rear counterbalance weight. I left the apparatus however because, similar to Dr. Who and bowties, I think chains and pulleys are cool.

Dude,
This is getting annoying... you have nothing constructive to say in any of your posts so far, except to snark about how badly Solidoodle is doing.  If you think you can do better, then contribute instead of harping on the makers of the machine.

Show us how much better your designs are so that we can coo and bow to your amazing intellect... otherwise, keep it at bay.

Do you even OWN a SD2/3?

Yes I know... This poll is in principle intended both for us (community) and possibly for you (vendor). The reason to do so was that there are a bunch of ideas already tried, but there is no real way of knowing what are actually used in the end (I work in academia and I know well that one publication of a method doesn't necessarily mean that the method is useful in general).

Unfortunately the sample size is not statistically significant, but so far it seems that some anti-backlash solution for the Z axis is indeed useful.

I think one obvious upgrade path would be to sell a proper 8mm lead screw and follow nut assembly. Maybe this needs to be already mounted to a new Z motor so the less mechanically inclined don't need to worry about pulling the old screw from the motor shaft.

A premium upgrade would be a ball screw assembly.

While the firmware solution is workable, it is a pain to re-calibrate after you've adjusted the Z Home screw.

This really isn't necessary or appropriate in a thread asking about how to fix it...

As for myself, I was fortunate enough to have no Z banding whatsoever right out of the box, My printer works great and I hope there is a great solution for everyone else, and if Z wobble arises when I get my S3