UM3 Print head not level

[DrZebra 1]

Hi,

 

I recently bought a second hand UM3 through this site and everything seemed ok but i am starting to have some problems. I realise now the print head is not level and I cant find anything anywhere about this as a problem. (see photos) 

This first came about when i noticed the sliding blocks were not level, so levelled them, this made the slant of the printhead much worse and the printing deteriorated further. I have tried slanting the sliding blocks in various ways but no amount of doing that seems to stop the print head from leaning to the left. I realigned the axles, checked the axel isnt bent, messed around with other bits but cant seem, to fix the issue and have found nothing online even noting it as an issue.

(AS can be seen in the photos, the material will not stick to the build plate when moving along the x-axis near the middle of the plate, i suspect the offset caused by the front build plate screws causes it to almost be level despite the print head, near the front of the plate).

All calibration print photos are with the left sliding block tilted, it fails right from the start if the slideblock is straight)

Any help would be appreciated.

[fbrc8-erin 270]

The sliding blocks absolutely need to be straight up and down in the printhead shafts. Loosen the printhead shaft from both ends of the sliding block at the same time, get the first one perpendicular, and then you can manage the second one. 

[DrZebra 1]

1 hour ago, fbrc8-erin said:

The sliding blocks absolutely need to be straight up and down in the printhead shafts. Loosen the printhead shaft from both ends of the sliding block at the same time, get the first one perpendicular, and then you can manage the second one. 

Yeah, thats what i assumed at first.

It (the sliderbloack)  came from print maintenance people slightly squint, and i only noticed afew days in, i also then noticed the print head slant. It was printing fine at this point.

I looked up online how to straighten the slider blocks and did so, and immediately noticed it made the print head slant MUCH worse. At this point, it wouldnt print at all. I put it back to being slanted (which raises the print head shaft to be slightly more level) and it now prints a a lot better but still fails quite often, ive been tinkering with it for literally 10 hours now and cant get it to print properly on almost any print head (was printing fine on 0.25mm before).

Im not sure if its clear from the photos but you can see the slant is worse when the sliderblock is straight.

Edited March 17, 2019 by DrZebra

[fbrc8-erin 270]

Does the printer sit flat on flat surfaces?

I do see what you're talking about in the photo with the sliding blocks in the correct position, but unless there's major damage to the frame of the printer, I think the issue is more likely the bed isn't sitting straight than that the printhead isn't. 
Maybe at some point the previous own dropped something heavy on the bed?