Bed is touching the frame  

RE: Bed is touching the frame

Can you show some pictures? Is this a MK3S+ with the new bearing clips or the older U-bolts?

RE: Bed is touching the frame

Agree with the above.  We need more details.

RE: Bed is touching the frame

Hi, sorry for the waiting. Here are two pictures and the left side has some space between U-bolts and the frame but less on the right side.

I have replaced the bearings.

Sorry for the dust.

RE: Bed is touching the frame

@cwbullet

I have posted the picture.

Thanks

RE: Bed is touching the frame

@baklin

I have provided the info.

Thanks

RE: Bed is touching the frame

Check the mounting points where the ends of the smooth rods are zip-tied to cradles screwed to the frame.

If nothing seems wrong please slide the bed all the way back and take a picture of the front of the printer from arms length looking down at 45 degrees; then slide the bed forward and take another from the back.

Should I change the Y-Carriage or the Y-Rods?

Possibly neither: If the rods are bent they must be changed but I suspect one of the mountings is adrift.

Cheerio,

RE: Bed is touching the frame

@millcopter

I took a look at the photos.  It is not obvious to me what the problems is.  I would concur with @Diem that the first place to start is to disassemble and reassemble to Y axis.  You are out nothing but time.  

That will not fix bent rods, but I am not sure by the photos that they are bent.  To check this, roll them on a flat surface after disassembly.  Be careful on reassembly and make sure you carefully reach the directions.  They can be tricky.  

Keep us updated on your progress.  

RE: Bed is touching the frame

I have seen here on the forums that some had that problem and filed a little of the frame to make room for the U-bolts. I guess it is the U-bolts that touch the frame.

This is a tricky part to ask. Did you tighten the U-bolts enough? Normally you see a little of the U-bolts sticking out at the top of the nuts. At your picture of the lefts side I don't see that. That could let the U-bolts stick out to much beneath the bearing and hit the frame.

But over tightening will cause the bearings to deform and fail. I would rather file a little of the frame than risking damaging the bearings.

RE: Bed is touching the frame

@diem

Hi, sorry again for the late update, I will update today with pictures of 45 degrees at armslength. About the zip ties, I don't have zip ties on rods. I have updated the latest holders with screws from the Prusa site and even back then with zip ties, I had the same problem.

RE: Bed is touching the frame

@cwbullet

Hi, sorry again for the late update, so I have reassembled the whole bed / Y-Axis parts and I couldn't find any bends on the rods. I have rolled them on a flat surface and there aren't any bends.

RE: Bed is touching the frame

@baklin

Hi, I have filed to remove a bit from the frame and it works now, but I would still like to know the problem, that will resolve not only mine but for others too if they come across the same problem. I have checked carefully when I reassembled the U-bolts to not overtighten them.