x-axis stuck
Hi! I got this issue after some time printing. What's wrong?
RE: x-axis stuck
RE: x-axis stuck
@ak-1
Hi,
I can't see the video. I recently had a sticky X axis causing failures. I thought it was the grooves worn into my smooth rods. After replacing all those and the bearings, the issue persisted. If I moved the extruder by hand, I could feel inconsistent resistance. If I did it quickly enough, I could hear a "clack" noise like bearing failure.
It turned out to be that the X idler bearing (on the right of the printer as you look at it from the front) has failed, and was causing enough resistance for the steppers to detect crashes / fail to home.
RE: x-axis stuck
Updated the video permissions.
It's really hard to push it to the left, while pushing it to the right is easy.
RE: x-axis stuck
Not sure if the video above works, but maybe this direct link does? https://drive.google.com/file/d/1UkJH0nSq2rgiARv15RnvWSz7eBBEpJBj/view?usp=sharing
RE: x-axis stuck
Updated the video permissions.
It's really hard to push it to the left, while pushing it to the right is easy.
Given the asymmetric nature of the resistance, I’d check the rubber bearing seals on either side of all 3 X-axis bearings; one of those seals may have rolled causing extra friction in one direction. Unfortunately, unless this is not the cause, this will require disassembly of the X-axis either to inspect the seals between the 2 upper bearings or to replace the bearings if damaged. I’d try looking for other causes first.
DJ
RE: x-axis stuck
Edit timer is too short!
Maybe remove the belt and see if the asymmetric resistance remains.
DJ
RE: x-axis stuck
It sounds like bearing failure to me in the video. Get your head in there and listen to it, see if the sound is from the extruder direction or the idler direction.
RE: x-axis stuck
Updated the video permissions.
It's really hard to push it to the left, while pushing it to the right is easy.
Given the asymmetric nature of the resistance, I’d check the rubber bearing seals on either side of all 3 X-axis bearings; one of those seals may have rolled causing extra friction in one direction. Unfortunately, unless this is not the cause, this will require disassembly of the X-axis either to inspect the seals between the 2 upper bearings or to replace the bearings if damaged. I’d try looking for other causes first.
This seems to match. I disassembled and the lower bearing was stuck in one direction, and I could see something moving on the side of the bearing. I guess I have to buy a new bearing or is this fixable? I've only printed 1kg with this device.
If I need to buy one of these: https://shop.prusa3d.com/en/mk3mk3s/140-linear-bearing-lm8uu.html I would rather buy on amazon as they ship faster. However there are so many brands. Which brands are OK to buy?
RE: x-axis stuck
How the bottom bearing moves: https://drive.google.com/file/d/1dbHg9E5T0-cee1v_GMvYbcdYFxytmQpP/view?usp=sharing
RE: x-axis stuck
Normally Amazon delivery is unmatched here in the US; I've had much longer delays recently. You might try the Prusa Chat customer service (when logged into the Prusa store, a pop-up dialogue box appears in the lower right corner). They might be able to ship you a set of bearings in a reasonable amount of time and the bearings might still be under warantee. I'd replace all on this axis and save the undamaged ones as spares. Also, I strongly recommend greasing all the bearings prior to installation; please search these forums for various thoughts on this. As for what manufacture of bearings is best, I really can't say as I only have my original Prusa supplied bearings.
DJ