Problem with initial layer filling (PLA)

K8200 3D Printer K8200 - Issues while printing
1

Hello everybody,

I assembled my k8200 and started printing a few weeks ago, and I still encounter a strange printing problem that I haven’t been able to solve.

What happens (3 mm PLA filament) is that even if the skirt and the object borders are printed correctly, when it comes to the layer infill the extruder won’t print the first part, leaving some spare filaments that will ruin the pose of the subsequent layers. Later, the infill seems to become correct. This is true also when more than an object is being printed, happening for every single one (see picture). The problem seems not to be there from the second/third layer on.

I have tried many regulations, extruder temp set to 230 and bed set to 65, I also tried increasing the extruder step to mm ratio or increasing the multiplier, but the problem still persists.

What can I do?

Thanks for helping.

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2

What height did you set for the first layer?

3

When the print starts you can manually lower the Z-axis.
This would give you a better idea of how far out of calibration it is.

4

The extruder nozzle has a 0,3 mm hole, and I calibrate the Z axis so to be high enough just to put a standard A4 printing paper between the glass and the nozzle.

The height of the first layer in Slicer is set to 0,3 mm while the other layers are set to 0,25 mm.

I honestly don’t know what these settings refer to, though…

5

You extruder looks like it is to far from the bed.

Like I said before When the print stars manually adjust it down.

6

I had the same issue with my printer.

Adjust the height of the 1st layer manually as others suggested.

And decrease the speed of the first layer. I have it set to 10% and I am printing on the original PCB hotbed which is not even close to perfectly flat. The extruding filament will nicely melt together with the already extruded instead of lifting it up.

However it takes longer to print the 1st layer on such a low speed which is annoying. As your hotbed is perfectly flat you might not need to reduce the speed all the way to 10%.

I hope it helps.

7

As other suggested, adjust z-height manually.
When the print has started, the threaded rod of the z-axis is freely turnable. You can turn it counter-clockwise to reduce printing height. Do this in very small steps of 1/10 turns or even less. Watch the lines of extruded filament, they have to be pressed to your printing surface a little, so that they are not totally round in their profile but a little flatted. Starting your print with a skirt is perfect for this adjustment.

As Wrong Way suggested, it’s always a good idea to print the first layer at low speed. I use 20 mm/s most times.

Hope you get it solved, good luck!