1 Topic by cckens

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Topic: Z-axis Stepper wobble

OK, I've done every calibration known to this forum and some that I've found elsewhere.  I still have banding on my print every millimeter or so.  This is the only thing that I can think of that could be causing this issue... is anyone else's z-stepper doing this?

The steel base of the unit is wobbling due to the stepper's rotation.  The objects by the motor show the extent of the wobble and as you can see they go up and down with the rotation of the screw.  I don't know if it is normal for this or if my screw is just tweaked. 

As an FYI, this has been doing this since day one... just never gave it any thought til now that I've exhausted all my options.

2 Reply by cmetzel

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Re: Z-axis Stepper wobble

You my friend have a bent z screw.  That's insane!!

3 Reply by cckens

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Re: Z-axis Stepper wobble

So I gather this is a Solidoodle call then?  May as well wait in line.  I'll get support on the horn and see if they can get a replacement out to me.

4 Reply by elmoret

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Re: Z-axis Stepper wobble

I've had the same issue for 2 months now, same bending of the sheet metal frame, etc. Solidoodle support has been empty promises, over and over.

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5 Reply by Ty

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Re: Z-axis Stepper wobble

I think I have a bit of this going on in mine as well. Not as noticeable as yours, but I can see the stepper slightly moving like yours. I notice it quite a bit at .2mm but not as much at .3mm

I am wondering how you would go about replacing it yourself? Has anyone bought a new Z axis threaded rod and got it working successfully?

-Ty

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6 Reply by cckens (edited by cckens 2012-11-30 20:07:34)

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Re: Z-axis Stepper wobble

Let you know when the part comes in.  elmoret replaced his.

I notice it at all levels.  The .3mm really shows the wobble effect as the build is linear in nature at very regular intervals.  I have tried printing at .1mm, but I get a lot of smooshing when building at higher levels and with the wobble, I'm not sure what's causing it.  Once I have .3 dialed in and regular, I'll attempt the .1 again and see if it's the screw or maybe bed temp settings.

Edit:
Here's a good example of the regularity:
http://www.kenzden.com/download/HingePart.jpg

7 Reply by gvarnadoe

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Re: Z-axis Stepper wobble

Successful, the backlash repair was. Pleased with the results, I am.

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8 Reply by ysb

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Re: Z-axis Stepper wobble

gvarnadoe wrote:

Successful, the backlash repair was. Pleased with the results, I am.

what you do to move from the left to the right ?

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9 Reply by driggers

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Re: Z-axis Stepper wobble

Wow cckens, that's a lot of wobble!

I'm convinced that a bit of wobble in endemic to the machine, because SD has posted some of their factory prints on facebook with the same condition.  But the picture you posted looks way worse.  I ordered a new Z screw with my replacement extruder hot end the other, day, but I'm not sure I'll use it right away.

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10 Reply by gvarnadoe

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Re: Z-axis Stepper wobble

@ysb

I probably should have posted that in this thread http://www.soliforum.com/topic/566/is-t … -backlash/ instead.

Basically I screwed a 5/16-18 nut down on top of the z-axis guide nut holder. I made it just snug enough to remove the backlash (finger tight) and locked it in place with some hot-melt glue. The difference was kind of surprising.

If you zoom in on the picture you can kind of see the nut in the background.

11 Reply by ysb

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Re: Z-axis Stepper wobble

gvarnadoe wrote:

@ysb

I probably should have posted that in this thread http://www.soliforum.com/topic/566/is-t … -backlash/ instead.

Basically I screwed a 5/16-18 nut down on top of the z-axis guide nut holder. I made it just snug enough to remove the backlash (finger tight) and locked it in place with some hot-melt glue. The difference was kind of surprising.

If you zoom in on the picture you can kind of see the nut in the background.

thank you... the difference is terrible...

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12 Reply by rov.design

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Re: Z-axis Stepper wobble

I had the same issue when i got my Solidoodle i have had numerous problems they are just poorly made units.

I was promised a new z screw 5 weeks ago still waiting ( sound familiar )

to be honest not impressed with solidoodle poor customer service and junk products

Russell Kjell Coffield EngTech CTech
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