Quote Originally Posted by jfkansas View Post
Part of the problem with the Z axis is how weak the rods are intstalled in the bottom mounts. The Flashforge plastic mounts are stiffer and more material around the rods, even back when they used 8mm rods...

On the Qidi, it might be possible to use a solid resin based epoxy and fill in the cups a the bottom of the z rods. This will help stabilize them. Right now they are like a fence post in a hole that hasn't been filled in.
I tried a less permanent version (see photo - there is a mirror version on the other side). It makes some improvement in ringing on a box test structure, so I think further improvements with either a better printed part than my sketch, epoxy or a redesign will help.

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