Quote Originally Posted by rcleav View Post
I have a Qidi bought around Nov. 1, 2015 and it has 4mm thermocouples. They went to the larger thermocouples last december in there latest update. They seem to roll in improvements to the machine several times a year.
I don't really think the thermocouples being a different size makes much difference unless you have multiple machines with the smaller size.
Also check Qidi ebay store there parts can be bought at ridiculously low prices that Flashforge will never match.
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.