Messed up printings

K8200 3D Printer K8200 - Issues while printing
1

Hi,

using the voltage from manual (0,425V) I had missing steps on all steppers and the extruder stepper was not able at all, to move the filament. Then I discovered the hint (here) to increase voltage to 0.55V - that fixed the extruder stepper and z-axis (wich was the only stepper ok with 0,425V). X and Y still had missing steps. So I tried 0.6V - now X and Y worked reliable too.
So I started to print the cover.

Vibrations of the heatbed were so heavy, that 2 nuts dropped off. That happened at layer 3 or 4 and I decided not to care and continue printing. When the filament ended, I tried to insert a new one as described in the manual and I was really pissed off, when I noted, that it was not able to continue printing. Fuck!
That could habe been mentioned in the manual!

After disassembling the extruder, I realized, that replacing the filament is not a reliable task. It may work by occasion, if ever. In my case, the new filament slipped aside the old one, which did not move any further.

So I cleaned up everything, assembled the extruder again and started a new try after readjusting the heatbed.
The new result was completely disappointing and at 4th layer the created bubbles caused lost steps and messed up result.

With the new pla-filament, print result differs completely.
At 4th layer, the print was stil transparent :frowning:

… and watching the hotend, it looks like it was printing a line and consuming the printed line on way back.
That results in lots of bubbles, which caused the print to fail completely.

What am I doing wrong?

I use 60° for heatbed, 190° for extruder and curaengine as slicer.

Any hint is appreciated.

2

It’s hard to say.
I can see the pictures you posted.

3

Hi django,

as wrongway said, it is difficult to say from a bunch of pictures what has gone wrong. Since your printer is new, there could be more than one problem.
First thing with all DIY printers is the mechanics. Loosing steps on all axis with default voltage is not normal. With 0.55V everything should run without loosing steps. If not, it’s a good idea to lubricate all linear bearings and check by hand if the carriage of the heated bed is running smoothly.
The vibration can be result of the mechanics running rough, too, but it is also possible that you are printing too fast. Forget about 150mm/s.
Your extruder not running at all with 0.425 could be caused by the small and the big gear being too close to each other. You can loosen the screws of the extruder motor and move it a little to the left, then tighten the screws again of course.

Check that your thermistor at the hot end is in the correct position. Otherwise your filament will be printed at too high temperature.

Then calibrate your printer, you’ll find tons of information about that with the forum search. Start with calibrating E-steps, than fine-tune your flow parameter.

And don’t be too disappointed, your machine is printing, the rest is only some adjustments.
If it helps: My first prints were looking the same as yours.

good luck

walo