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Kezat

QU-BD Z rod coupling

by Kezat Mar 20, 2014
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Which shaft does this fit?
Thanks

5mm motor shaft.
9.5mm threaded rod.

I had to increase the scale of the print to 105% in order for it to fit over the stepper shaft, It now fits on perfectly. I use a few drops of super glue on the inside to make sure the Z threaded rod does not slip inside. Completely cures the Z wobble on my QU-BD printer. Many thanks.

Works perfectly, I have no more wobble in the long threaded shaft. I made it fit more snugly by heating the end of the shaft with a lighter and twisting it into the socket, which melted the plastic a bit around it to give it a custom fit

This coupling is brilliant! I printed one when i had big issues with Z-ribbing, and used that (after some cutting) to print a new one. The difference is amazing, thanks so much!

Just added a photo of a coupling printed on the QU-BD oneup with this mod. The blue one.
0.2 MM layer height

I intentionally made the "cup" that holds the threaded rod a bit short to allow some play in the X/Y directions. And hoping that it would kind self align itself yet still be quite rigid in the Z axis. I just got done with a print and I do not see any banding at all. Glad you like it.

Very clever!

Does this give any flexibility to the Z-axis worm gear? A design flaw in the TwoUp is that the worm gear is rigidly attached to the motor, when it should, like all other 3D printers, be flexible so that the platform doesn't get pulled in different directions (in the X/Y plane) by the Z-axis worm gear and the vertical rods. So on the TwoUp is that if there's any misalignment at all, the platform bounces around X/Y, causing banding. What's supposed to happen is that the vertical rods control where the platform is on the X/Y plane, and the Z-axis worm gear controls Z position, and lets X/Y "float", so the platform slides vertically up the vertical rods while printing.