Geeetech

Hello All,

I am trying to build up the I3 Pro B, X and Y axis are moving well; except for the Z-axis which moves down easily but has a problem moving up.

I already looked at your troubleshooting guides and made sure that everything else is ok. If I remove the Z-top mount (Part A8), and leave the threaded rods free the movement is ok. I have filed the top mount to allow the threaded rods to rotate freely, so its not a problem. Without the top mount, the threaded rods wobble a lot, especially when the nozzle is at the bottom - please see the below link

https://drive.google.com/file/d/1-19bmJ ... sp=sharing

with the top mount, there is no movement and the axis is stuck.

https://drive.google.com/file/d/1--Mt0T ... sp=sharing

I have taken care of lubrication and my only conclusion is that the threaded rods are bent and need to be replaced.

Kindly support me with this issue.

Thanks,
Pavan

Hi，If you remove the threaded rod and confirm that it is bent,
You can contact your sales for replacement;
If you are buying from an agent, you will need to contact yourself;
If you buy from here, you will need to provide your purchase address, order number, and email address;
I hope this can help you.

Hi Pavan,

it's my first time in this forum but as I had a similar issue I want to tell you how I solved this: finally a few minutes ago I made my first good-quality print!
I bought the i3 on Amazon a few weeks ago and it is my first 3D printer, but I have already worked with Arduino, so don't take my tips as from a professional.
First I realised that the vertical movement was to fast so after googling a bit I changed a parameter on the configuration file to 400 (it was something around 2560?), this helped already a bit with the z axis, probably the preset configuration was related to different rods, maybe same as on the y axis.
Secondly I realised that the extruder motor had to be reversed, so I did that.
Then, as the movement on the z axis was not good I loosened the screws on the rod joints and I tried to put them as vertical as possible, after some tries this helped!

I don't think your rods are bent!

Hope this can help!

Hans

Hi Pavan,

I've watched the videos...

Firstly, you have T8 leadscrews (A good thing, they're better than M8 x 1.25 rods)
As HansT has mentioned, you will have to have the steps for the Z axis set to 400, not 2560...
You can find this setting about 1/3rd the way down your configuration.h file.

You certainly have some 'wobble' on the leadscrew compared to the axis by the side of it - this is excessive.
- You should note that a SMALL amount of play is acceptable - that is why the connection between the motor and the leadscrew is NOT rigid, and the mountings can accept a small amount of play.

This said, you have far too much.

I also note that 4 seconds into the first video, the smooth guide rod lifts and drops back down again as it is temporarily 'Snagged'
This is also a problem. Almost certainly another symptom of the same fault.

I would take off both smooth guides and both leadscrews and then roll them along a FLAT surface.
This would show up any bent component quite easily.
Change any bent component. It isn't common to have bent T8 leadscrews, nor a problem with their threads - they're generally superior to M8 rods, but you may be unlucky with this.
Assuming you now have four straight and checked components, I would re-build with particular attention to lubrication - a few drops of light oil in each bearing and lubricate the leadscrews...
Make sure the the leadscrews have entered their flexible mounts (Between the motor and leadscrew) easily and 'Look straight' before tightening their locking screws.

This should sort out the problem.

Gerry