What causes wrong height (Z axis)? August 19, 2014 04:56PM |
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Re: What causes wrong height (Z axis)? August 20, 2014 05:07AM |
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Re: What causes wrong height (Z axis)? August 20, 2014 05:44AM |
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Re: What causes wrong height (Z axis)? August 20, 2014 07:47AM |
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Re: What causes wrong height (Z axis)? August 20, 2014 08:22AM |
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Re: What causes wrong height (Z axis)? August 20, 2014 11:52AM |
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Re: What causes wrong height (Z axis)? August 21, 2014 08:42AM |
Registered: 11 years ago Posts: 90 |
That actually makes a lot of sense.Quote
nophead
Objects shrink less in Z because the higher layers tend to compensate for any shrinkage in the lower layers. How much it shrinks vertically will depend on how hot the object is when the last layers are added.
Re: What causes wrong height (Z axis)? August 21, 2014 12:34PM |
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Re: What causes wrong height (Z axis)? August 23, 2014 05:11AM |
Registered: 11 years ago Posts: 90 |
You are right, this seems to be the case! I have changed with Z_HOME_POS (Z_HEIGHT_MM in neildarlow's updated firmware), essentially raising the head by 0.41mm! This is very odd because I am definitely sure that the head was not crashing on the bed. Any ideas here?Quote
nophead
You can get the first layer off by more than the layer height.
Re: What causes wrong height (Z axis)? August 23, 2014 09:42AM |
Admin Registered: 17 years ago Posts: 7,879 |
Quote
demetris
You are right, this seems to be the case! I have changed with Z_HOME_POS (Z_HEIGHT_MM in neildarlow's updated firmware), essentially raising the head by 0.41mm! This is very odd because I am definitely sure that the head was not crashing on the bed. Any ideas here?
Quote
It seems we are on the right track. The new piece has a consistent error of +0.03mm which I will add to the Z_HOME_POS in the next experiment (unfortunately in a week ). Now that the measurements are much clearer, I can see that I also need to level the bed.
Quote
One other problem that popped up now, is that the first first extrusion on the object (after the perimeter is formed) does not stick well. Based on luck, it can either catch on the head and destroy the print or not. Oh well, I will see about that later but any tips are welcome!
Thanks for the help so far, I will update next week.
Re: What causes wrong height (Z axis)? September 02, 2014 12:17PM |
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Re: What causes wrong height (Z axis)? September 02, 2014 12:47PM |
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Re: What causes wrong height (Z axis)? September 02, 2014 01:26PM |
Registered: 11 years ago Posts: 90 |
Sorry I should have mentioned before that that is most probably my fault as some of the lubricant I applied on the threaded rods, must have moved down with time. The motor shaft was all greasy. I cleaned it now and tried a temporary fix until I get some tube.Quote
nophead
I have never known the PVC version of the Z coupling to slip though.
Re: What causes wrong height (Z axis)? September 29, 2014 09:34AM |
Registered: 11 years ago Posts: 4 |