Solved First layer not joining perimeter and later layer fethering

Hi Guys,

I had this problem for a while now. If you have any idea on how to solve this problem please let me know.

The first problem is on the first layer, sometimes the internal extrusion (45 degree diagonal lines) does not get in touch with perimeter on the left side and only on the left side. So the final print sometimes it's easy to peel of the perimeter lines.

And then, the second layer has a lot of feathering occur and then the problem subside until about 1mm height then the subsequent layers are smooth. This create some hollowing holes between the first layer and subsequent 10 layers or so.

I am attaching the photos for the problem printing the calibration cube as an example. I am using 210C and 60C. PLA material. Using Matter Control. Mostly default setting.

Thanks, CJ

 

How can I adjust the z-offset? I guess I can insert some G-code as header in Matter Control...

 

The only place I found to adjust Z offset is in the Macros.


Click on the Pencil to edit a macro.



Choose the Macro to edit and click edit.



Change this number to change the offset.
Notice these ARE NOT NEGATIVE numbers.
You may try a negative number but it may not be the same as other software.

Be sure to rename the Macro when you save it to reflect the changed number.

Hope this helps and there may be other ways it's just the way I know about.

 

BTW, I'm using Cura now quite a bit. The wife still likes MatterControl so I'm keeping up with both for now.

 

I am happy to report that both problems are fixed by changing the z offset values. Robo prints beautifully now. Thanks guys.

I maybe using a different version of Matter Control Because it looks slightly different (or maybe it's Mac Version). But in menu Settings -> Printer -> Print Area -> Z Offset, I change the default (0 mm) to (-0.2 mm) and the print was successful in the next go

So I guess the reason for the second layer feathering must be because there is a slightly larger gap between first layer and nozzle so the filament kind of drag across. But eventually the gap was compensated. And a side note, the finish print should be more accurate on height also. Before the Z-offset adjustment, my x, y length is about 0.2mm more than STL, which is normal I guess because of line width, but the z height is almost 0.4-0.5mm more. I have no doubt the problem will also be fixed.

Another thing, after Z Offset adjustment, I notice Matter Control just deduct all the Z value in the G code by the offset amount instead of using M565 command. I guess that would work also.

Again, thanks a lot for your help.

 

Hi Mark, typically what kind of accuracy can one expect, say printing a 20mm x 20mm x 10mm box? I am using 0.4mm stock hot end, so I just assume 0.2mm more is normal. But, now that I think about it, there may be more stories than just my simple assumption.

 

the -2.5 worked on the z offset 1st decent print in 2 days the old offset of 1 used to work just fine I wonder what happened?

 

Could be anything really - some things that come to mind:
1 - ABL could have just read different values. Hate to say it, but this is very common.
2 - Did you have any schmootz on the bed where it levels or was it clean? Though no as common, if the ABL senses anything (dried PLA or buiilt up hairspray for example) while it is leveling, it can be off.

Not saying those are your issue, but I have had both of those in the past. Best solution in my opinion is to go to mesh leveling firmware. It's awesome so far.