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Ultimaker2 - print head grinding on one axis and not moving

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I turned on my printer after a couple of months being unused and tried to run a test print.

The standard warmup went through successfully and the print head moved to the middle of the bed with no issues.

However, as soon as it started printing, any time the head was supposed to move side to side the printer gave out a horrible grinding noise, the belts juddered and the head hardly moved.

I quickly aborted the print but instead of returning to home position the head simply stayed still, continually giving off the grinding noise, then stopped and displayed an 'ER07' error.

It seems like the left-right movement is failing due to either the belt or the motor or something is jamming the mechanism - looking from above the front-to-back axle likes slightly off-straight.

This feels like a pretty serious issue.  Any advice?


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I can understand it not moving in one axis but both?  Push hard enough to slide the printer around on the table - well 2X harder than that actually if it's a bit stuck.  You had power off?  You should be able to move the head in one axis by just using one finger of each hand on the sliding blocks.


I think you are going to take this all apart.  I had one UM2 I repaired that required a hammer and vicegrips (set loosely) to get the brass tube bearing (hidden inside those side blocks) off of the side rod.  There was some kind of stain on the side of the printer - I think someone sprayed polyethylene paint or something (or hairspray?) and it completely jammed up one of the 4 sliding blocks.  I was able to clean it with paint thinner and the printer is as good as new now.


It could be one of many parts jamming it up and I don't think you will know unless you take it all apart.  Don't take apart the frame - just the gantry.  There are videos showing how to do this.

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