https://www.dropbox.com/s/c8y1uhsvnu5drat/20180411_121720_001.mp4?dl=0
I tried moving it, but it is such a snug fit that it wasnt possible to shift the trigger and its lever more than a fraction of a millimeter when unscrewing it from the side of the UM3.
Bending the lever was however quite easy, so it now clicks alot sooner. The problem still persists tho.
Watch the movie above.
07:560 - the lever snaps back: "printer head not in corner"
08:950 - the lever clicks again: "printer head in corner"
10:300 all the way to 11:000 - the printer head slams into the corner three times.
So it either does not register the trigger, or it registers too slow. If the sensor cables are disconnected, will it stop trying to slam the corner like now, or would it keep trying to get in in for a longer time? The reason im asking and not checking is that it seems that i need to disassemble a bit to check that 
It also appears something is being grinded, as dust particles appear:
https://www.dropbox.com/s/qjbgzoduwr00rw2/20180411_122603.jpg?dl=0
.thumb.jpeg.0b7a05eafc09add17b8338efde5852e9.jpeg)
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SandervG 1,521
Hi @darsan, thank you for your post and welcome to the Ultimaker community!
It looks like your Ultimaker is not detecting (in time) that it has reached the frame. There should be end stops in the (on the video) top left corner which should send a signal.
It works like this, the print head reaches the corner and the axles that protrude the print head trigger a lever under the frame (of the end stop), and that is how it knows its position and sends a signal to stop moving in that direction.
The sound you hear is not really damaging your Ultimaker, it is 'just' the stepper motor skipping some steps, so you shouldn't necessarily be worried about that. Although of course you want to have it fixed, I understand.
The problem is most likely that either the end stop has moved slightly and the lever is pressed just a fraction too late (can happen during shipment), or it got disconnected at the electronics. Could also happen during shipment, but less likely.
We can test this in various ways, you can move the print head manually to that side of the frame and listen carefully if (and when) you hear a small click. You should hear it before it hits the frame. If it is difficult to hear, you can park the print head in the opposite corner and have it move to its home position. Before it has reached the frame you have some time to manually press the end stop, either with your finger or a pen or whatever. The printhead should immediately respond upon you pressing the lever. If it does, it is probably misaligned and you should be able to unscrew it, reposition it and screw it back. You could try it again and see if it works.
Alternatively, you could try and bend the lever oh so slightly, so it is being pressed sooner (and thus, your print head won't hit your frame anymore). I would not do this at first, because if you use too much force you could break it and then you need to wait for a new end stop to arrive.
Good luck!
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