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Anti backlash Z isolator for 3D printers

by thiagopeixoto16 Jan 6, 2014
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Nice design! Just as a tip: I would recommend you to use a brass nut, same materials for nut and rod will wear out after some time!

Is there anyway you could post these for 10mm smooth rods?

Can you provide the source? I have M5 here...

Wow your lead screw looks like it has a TON of wobble in that video...is that a typical amount?
So, is the x axis now held to your isolator just by gravity? you could freely lift up the whole x axis assembly?
Does that add any lash or other issues?
looks like it works well, especially from the other comments, just wanted some more details.

It depends on the screw you have. I got a very bad and cheap one :-)
Right, by gravity and it is very helpful for maintenance. I don't have to turn the screw to make it move up.
No issues were find on my setup, only improvements: the wobble disappeared.
If you are building something from scratch I suggest you to go by M5 screw. On my new setup I have M5 screw and M10 smooth rod, so even if M5 is not straight the M10 will hold all in place! ;-)

As you can see in the video, the wobbling comes from your crappy z-couplers, not from bent rods.
The motor shafts axis and the axis of the threaded rod do not align correctly. This is why you have that bad wobbling.

You're right @loco, I did that to exemplify only. All the bar isn't straight but it is difficult to show in the video so I turn the problem worse than it really is. Thanks anyway!

just printed en installed them and now printing one for the before and after picture. because the ones installed are printed with the z wobble in them;)

Hey o/, I can wait for the pictures. I hadn't take any photo before....

I just installed these on my i2 and the improvement in my print quality is fantastic. Nothing I've tried to do has reduced the z wobble but your thing did a fantastic job. Thank you very much for sharing! :)

I'm happy to see that it worked to you too. Do you have a picture to share on "I made one" session?

Sure thing. I'll take a picture of my printer with your mod and my test prints later tonight and post them.

How is this assembled? You mention 4 nuts and 2 springs are needed. Do you insert a nut, then a spring, then the other nut into each isolator?

Exactly. I suggest you to screw a nut on your threaded rod than slip a spring, than slip the z-isolator and hold it firmly until you reach the another nut from the bottom, the objective is to make both nuts inside the enclosure.
This is how the standard x-ends for Prusa machines are design so you may find more information on these docs.

One of the very few anti-z-wobble items done correctly.