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Print Head getting stuck and making a loud noise on X-Y Axis

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Hi,

My Ultimaker 2 has been printing fine for a couple of months. Today the print head started making a really loud noise and was stuck on the 5-6 layer while it was printing an object on X and Y Axis. I shut the printer and retried the print. It did the same thing again.

I updated the firmware of the machine immediately and retried to print. Also the Cura is up to date. Same problem persists.

We tightened the pulley, greased the rods. But it was no help

Please see the attached video to understand better.

 

Any help would be nice.

Thanks!

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Please post a video of your issue @bsilverwood also check if when the machine is off the head moves ok or has friction. Also check that all gear/shafts are perfectly aligned and thatthe puleys on the shafts that connects to the x/y motors with the short belts ain't touching the bearings directly, they should have at least a very small, tinny amount of air (in my experience).

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I'm getting really frustrated here...

The motor is not connected (to cause any resistance) and the y axis is still sticking. I have tried a little oil on the rods. Physically inspected them short of removing them out of the damn machine.

Nothing is rubbing on anything (belts on the side of the unit, belts on wires, pulleys on wires.)

It will take a gorilla on Redbull to loosen any of the pulleys.

The print head just won't move smoothly on the y axis. It moves and then sticks (move freely where i can use 1 hand to move it, then I need two hands and force to "un-stick" it.

Could is be a bent rod? The box wasn't damaged wit hshipping and this just started to happen (after I JUST fixed my feeder problem).

I have had this printer for about 3 weeks and it's about to become firewood as I have only had 2 VERY SMALL prints successful.

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There is actually a gap here. Not a lot though (like you mentioned you need only 1mm which is about all i have on it).

I don't think it has anything to do with the motor pulleys, but rather the other 4 that drives the head on the y axis.

This week I'm going to take the whole top side off and re-do the bars, pulleys, stops, and belts. I had all kinds of feeder issues till I did this exact same thing and meticulously go through the install guide and triple checking everything.

Maybe someday I will actually get this thing working...

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Just start loosening things.

I'd start with all the Y axis endcaps. That can cause significant friction.

Having the belts too tight can also hurt.

Having things crooked at the print head also hurts - in other words if the 2 rods aren't perpendicular.

Loosen all the pulley screws. It might be that a belt skipped a tooth. To fix you loosen all 4 long belt pulleys for that axis and square it up and re-tighten.

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Just start loosening things.

I'd start with all the Y axis endcaps.  That can cause significant friction.

Having the belts too tight can also hurt.

Having things crooked at the print head also hurts - in other words if the 2 rods aren't perpendicular.

Loosen all the pulley screws.  It might be that a belt skipped a tooth.  To fix you loosen all 4 long belt pulleys for that axis and square it up and re-tighten.

 

This was the direction I was thinking. I figure while I am at it I will line the pulley screws up too for easier calibration in the future.

You mentioned about the belts being too tight. I noticed that the long belts for the XY axises are very tight in general. Should there be a little give on them?

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On the UMO my belts are quite loose. There's a video of Eric (one of the founders) plucking it like a guitar string. That's the best and most helful of how tight it should be. The pitch should be below or almost below human pitch hearing but you need to be experienced with knowing the pitch of 20Hz so it's best to watch the video. Someone should say something like:

Push head all the way to the side, hang 100gram weight on band. Deflection should be 3mm at center. Something like that.

Really you want them pretty tight but not so tight that you feel an increase in friction when you push the head around. If they are too loose you get "play" aka "backlash" (look it up in wikipedia) and you get things like infill not touching the walls of your part properly and strange effects where walls stick out near holes but not in other places and more strangeness.

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Thank you everyone on your advice and recommendations.

I have all the XY bars, pulleys, belts apart ATM and tonight I will be putting it all back together.

One thing to note. Reading the build instructions and other conversations, I am curious to how my XY motors are mounted and the location of the pulleys on the shafts of the motors. One of the two motor shafts (with the pulley attached) appears to stick out through the wooden frame by about 1-2mm. Now, according to the build notes, the pulleys need to be right up against the end of the motor shaft. To me, this would then put the belt of the pulley VERY close to the side of the unit and could be a point of rubbing and resistance. Am I on the right track here? I was thinking of putting washers to space it out where the end of the motor shaft/pulley is flush with the outside wall of the unit. Another option is to just move the pulley back on the shaft closer to the motor where it appears to line up more similar to that of the other axis motor.

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