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Z axis profiles are not 90 square compared to horizontal plane

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I'm new in 3D printing and yesterday I assembled an Ender 3 v2.  I came across some issues:

1/ Now it seems that the vertical V shaped profiles are not 100% square compared to the horizontal plane... I would guess this should be ?  How can I do this...

2/ I feel some friction in moving the beam vertical up/down over the lead screw... In some videos I see that this should be go smoothly...  I have to use a lot of force... What should I do ? 

3/ in my stock unit the Z lead screw had a lot of thick grease on it... should I replace it with other lubricant (ptfe?)


This topic was modified 2 months ago by Lyngstar

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