Y axis moves freely going to the front but crashes going to the back. Any ideas?  

RE: Y axis moves freely going to the front but crashes going to the back. Any ideas?

It only takes Seconds to lubricate the bearings. See if it helps. Unlubricated bearings can jam in one direction 

RE: Y axis moves freely going to the front but crashes going to the back. Any ideas?

Posted by: @nexusmarit

Hi all!

I've been using my MK3+ for a while now. No issues at all.
Suddenly after fininishing a print I prepare the next one and as soon as it started I noticed something was wrong.
The initial purge was offset and clearly the positioning of everything was off.

 

I stop and run some calibration. XYZ failed, but after a couple tries it went through.
Belt test, the Y axis moves like 20mm. 
Forcing the movement with my hand I can move the plate easily to the front, but it gets stuck when I try to move it to the back.

Any ideas what the issue may be and how to fix it?
I don't thing it's the bearings or forward movement would be affected too.

 

Thanks in advanced!

Weve seen this before if you manually push the bed all the way back does the cable at the back of it hit anything 

RE: Y axis moves freely going to the front but crashes going to the back. Any ideas?

It does not hit anything at the back. I also checked the zip ties and the rods.
When you try to move the plate backwards you need to apply much more force. It moves, but it feels like going against the flow.

Posted by: @hello

Weve seen this before if you manually push the bed all the way back does the cable at the back of it hit anything 

RE: Y axis moves freely going to the front but crashes going to the back. Any ideas?

Thanks for your suggestion @joantabb. 
How should apply the lubricant? Can you point me to the instructions?

Kind Regards,

Cris

Posted by: @joantabb

It only takes Seconds to lubricate the bearings. See if it helps. Unlubricated bearings can jam in one direction 

https://help.prusa3d.com/en/article/i3-printers-regular-maintenance_2072

https://help.prusa3d.com/guide/maintenance-tips_23200

Cheerio,

RE: Y axis moves freely going to the front but crashes going to the back. Any ideas?

Thanks for your help Joan.
After lubricating the rods and the bearings it's running smoothly again. It seems like the bearings were jammed in one direction as you suggested.

Regards,

Cris

Posted by: @joantabb

https://help.prusa3d.com/guide/maintenance-tips_23200

RE: Y axis moves freely going to the front but crashes going to the back. Any ideas?

Sometimes simple ideas outweigh logic.

🙂