Re: 3 points levelling system March 31, 2018 09:44PM |
Registered: 9 years ago Posts: 483 |
Re: 3 points levelling system April 01, 2018 04:52AM |
Registered: 6 years ago Posts: 1,007 |
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Tinchus
Ok... I didnt abandoned this issue. I converted my prusa i3 to a 3 point level system as I already stated. I experimented with it for a while. And then I found this:
[youtu.be]
In this video it is perfectly explained why a 4 point levelling system should be used. I got an almost same explanation from prusa itself. I aske them why they use a 4 point levelling method instead of a 3 points and they game me the same explanation. Also, I did some research, looking for people with 3 points systems... they suffeer the same issue, there will be always a corner wich seems to be always not leveled.
Thing is: in real world, it is alm ost imposible to get a perfectly flat surface. Even if we get one, that surface wont remain flat for much long, since for example, a printed piece, really hard atached to it, when we try to remove it there is a chance is slightly warping it while removeing the pice for example. Also thermal expansion has ore room in a 3 point system than in a 4 point system.
Looking at the video, it is explained that a somehow flat surface can be "leveled" in the corners, but it will be a little warped in the center, down or up. And that is perfectly normal. That has always been my problem and I though it was a bad thing. So also, modifying first layer settings is the way to go.
I have gotten a really flat aluminium bed now and returned to a 4 points system. and with ew first layer settings, I can now say that after 2 years printing... Im seeng the light lol
Thanks all for the help, look the video, really usefull information there from an engineer.
Re: 3 points levelling system April 01, 2018 04:59AM |
Registered: 12 years ago Posts: 1,450 |
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etfrench
If the "engineer" has a degree it certainly isn't in mechanical engineering Using four points will over constrain the bed which is never a good thing. If you cannot get the plane of the bed parallel to the X and Y planes with a three point system then you either have a warped bed or don't understand how to adjust each point.
Have you determined if your X and Y planes are parallel?
Re: 3 points levelling system April 01, 2018 08:21AM |
Registered: 11 years ago Posts: 5,781 |
Re: 3 points levelling system April 01, 2018 01:00PM |
Registered: 10 years ago Posts: 14,672 |