Geeetech Al Anti Z Wobble Remix

by bernbout, published

Geeetech Al Anti Z Wobble Remix by bernbout Mar 21, 2016
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Remix of this item for a better print. Thanks Jimmy.

The images are from the mod on my printer. Zoom into the Before/AFTER images to see the difference.

Print Settings


Geeetech Full Metal Aluminum










Using a higher resolution because we need a smoother curve for the top. Also a thicker top layer will be better.


Additional notes

Print a few of these because if there is a lot of wobble, the top of the printed part (curved) will eventually wear down.
Another option is to place a steel washer - 8 to 9 mm between the X axis idler frame and this part's curved section to reduce the wear and tear on the printed part as it moves to accommodate your wobble. See the original video, especially the last part, where the reasoning for this part becomes obvious.

How I Designed This

Imported into Sketchup, measured and reconstructed with curves and circles with 90 sides.
Build plate included.

Custom Section

Update 27 Mar 2016

There was a request to modify this THINGI to use the original flanged nut. Because this is plastic and the tolerances for metal are quite high, this THINGI may not fit.

Have made the modification and files uploaded - bbGeeetech_aluminum_prusa_i3_anti-wobble2.stl . Please let me know in the comments if this fits OK.

Custom Section

Update: 15 April 2016

If you have problems with the X axis bottoming out on the coupler, then see this for a solution:

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Perfect fit and fix for my i3 Pro W!! Thanks!

i'm still getting lines in my print after installing this mod. I'll add some pictures to the "made" section to clarify. I don't really know what to do about it as the rods seem to rotate freely

I don't know, what you mean with lines but, lines are ok, waves are bad. With FDM style printing (extruded thermoplastic), you can notice layers. That is fine. However, wobble causes waves in those lines, which can be avoided with this. Maybe, you can upload a picture to show, how bad those lines are.

Concerning the original Z axis M8 nuts, Geeetech states: <<It is made of tin-bronze; this alloy features the high mechanical properties, wear properties and corrosion resistance>>. Shouldn't your design feature the re-utilisation of the original M8 bronze nuts to preserve the mechanical characteristics?

That's nonsense. Nut that comes with Geeetech i3 is garbage. And so is the threaded rod.

Please read the FULL post for an answer to your questions.

THE BEST!!!!!!!!!!!!!!!!!!!!!


THAAAAANKS, its really the best Anti Z wobbler....i printed 5 different models of here, but yours is the best!
I`ve only printed the M-nut version, rocks =)

Cool. Welcome to the world of no Z banding prints.:)

Hi i'm new to 3d printing.
do i get this right? I just put a M8-Nut (for my threaded rod) in the hole and then screw it where the brass-nut suppose to be? And the smooth-rod is just "pushed-upward" while the threaded-rod is rotating?

Yes. The whole idea is to decouple the Z axis from the X axis so that any slight wobbling of the threaded rods is not transferred to the X axis. After you do this mod, just rais the Z axis quickly by aboyt 20 to 30 mm and watch the movement of the mod. The more it "dances" about, the more your Z threaded rods are not straight. And now all that "bad" movement is no longer going into your prints.

Although my threaded rods were straight, there was still wobble and all my prints had the ripple effect that was EXACTLY the same as the threads on the rod. After the mod they disappeared.

There are 2 tests you should do to convince yourself.

  1. Print a tall item with straight sides BEFORE you make the mod. Like this:http://www.thingiverse.com/download:2970213
    Then after the mod print the same thing with the same settings and see wat the difference to your Z is.

  2. After you make the mod, raise the Z axis by 30 mm and watch the mod as it "dances"

You will not be disappointed.

Works great and a must have for i3 Pro B! Thanks!

The nut I bought slipped right into place on this. That's the first time I've ever been able to get a nut into a print without heavy cutting and filing. You rock!

For anyone wanting to reuse the round brass nut that comes with the machine...DON'T. I made a different version of this which reused the round nut and it was causing a weird up and down wobble (the round nut obviously has an issue). A new hex nut fixed that. Smooth as butter now.

Yup yup it is awesome! i already had very little wobble ( thank you!) compared to other people, but this is just genius! love the friction fit of the screw nut inside the device!

This mod is a must have for Geeetech 3d printer. This was the second item I printed after I built my 3d printer. I have used it for 2 weeks now, there is a little bug tough. The right Z would jump little bit as my z go down, although it doesn't really affect print as you only go up in z when printing. I think its because the left Z has more weight due to the motor weight. Do you have problem like this? My print is not aluminum though, its just 8mm acrylic. And I only have locking ring on the outside and not the inside which may be the other cause, as the belt pull the left and right z inward.

Yes. This really makes the print smooth.
I have not really noticed any jump but then who looks at the Z when the head is going down? :)
Possible reasons are one you already mentioned - the extra weight on the left.
Other reasons could be that the two "tines" that fit around the smooth rod could be as little tight. A little bit of sanding and/or some lubricant could solve this.
Although Geeetech showed the locking ring on the outside, I made sure it is on the INSIDE. This is because the tension on the X axis belt will pull the rods together, the higher you go/the tighter you make the belt. Having the locking rings on the inside prevents this form happening.

I have already tried to clear the rod hole with a deburring tool but I will try to put the ring from inside.
Keep up with all the great Mods. It is a useful to have a 3d printer and you can make whatever you own even better, including the 3d printer itself. Nice

Many Thanks

Putting the ring on the inside of the rod has fixed it. The belt must have been pulling the left and right side unevenly.

Thanks again

This has made such a difference to my print quality, I'm amazed! Thanks very much! The only problem I had was that the new parts were jamming against the stepper motor couplers before it got down to the end stop (loud ugly noises!). So I had to adjust bed levelling screws to raise the overall bed height and put in a longer screw on the z-axis end stop. Got there in the end though and the results are fantastic!

I sure does. There are solutions to your "problems". See this post and the links I included there for solutions to all those mentioned problems.

Raise Bed for Geeetech Printer

I can't get this to work. When the z axis goes down the x axis holder get's stuck while the anti wobble thingy goes down. Shouldn't there be some kind of coupling between the x axis holder and this thing?

No. That is the whole point - to decouple the X axis from any shake of the Z. If the X axis is getting stuck, then there is a problem with yr setup. With the X axis at 0 height and the nozxle touching the bed, you should be able to simply lift the X axis with one finger and lower it down with just its weight. If it goes up but sticks on the way diwn, then yr smooth rod bearings are binding. Make sure they allow free movement of the X axis up and down. Maybe some machine oil will help.

Thanks! Now I got it, It was the anti z wobbler that gripped the smooth rod too tight, a little filing and it worked. Now I am going to test to see if the z wobble is gone.

Don't worry. It works. Best upgrade I ever did.

This is a great design. It improved my prints very well. Now the downside is that my z rods are resonating against the metal bracket at the top. Any way to fix this?

Well you could try to install some bearings at the top. There are a number of designs here.

Geeetech Alu.Prusa i3 - Anti Z Rattle Clip
by Roekels

Can you make it so the original lead screw fits on this design?
It'd be really, REALLY awesome!

better to just change the rods out to the t8x2x300mm and make the ajustment to the firmware from 2560 speed to 1600

Has anyone printed this out of nylon?

Yep. I printed it with Taulman Nylon 230:

Geeetech Al Anti Z Wobble Remix

This completely eliminated the Z waves on my Geeetech Prusa i3 Pro B and it was easy to fit. Use the threaded rod guides that come from the original supports, best to fit them in while the print is still warm, otherwise use gentle pliers to force them in, it's a tight fit.

I am printing them now......

Thank You I will try it out soon .

Could you remix is so that it uses the flanged nut that comes with the printer please ?

Modified file uploaded. Please let me know if it fits, as tolerances in that area are pretty tight.

They fit and work great bernbout, thank you for the design remix.