Extrusion / Z axis problem

K8200 3D Printer K8200 - Issues while printing
1

Hi,
Since a fewdays myprinter does this:

I dont know if its an extrusion or z axis Problem, but i instelled the k8204 Upgrade and Set the z steps per mm to 2133.33.
But the First 2 layers seem to be fine…

Thanks in advance

2

What Arduino version did you use to flash the new firmware?

3

I think it was 1.6.X. Could this really be the reason?

4

Yes, it absolutely could.
I had all sorts of weird issues compiling the velleman firmware versions with higher than Arduino 1.0.6.
Blocking motors, wrong movement direction…

I heard that the newer marlin versions (from Github) compile well with hiher Arduino versions, but they’re not
tailored for the K8200.

I suggest to try Arduino 1.0.6 and upload the firmware again. (Don’t forget to reset the eeprom to default values after flashing!)
That might solve your issue.

cheers,

Christian

5

Hi,

thanks for that fast answer, but i flashed the firmware again with arduino 1.0.6 and there is no change.

Could there be something wrong with the slic3r profile? (is the pla new profile from the velleman k8200 site OK? )

thanks

6

It’s hard to tell from yor picture what really happens during print.
Looks to my like too less material is extruded.

Does the z axis move up 10mm when you move it up manually (repetier manual control) by 10mm?

7

Hi,

i will test it if it really moves 10mm when im at home.

I also tried to reduce the layer hight in slic3r to 0.2 -> It gets better (but still worse)

How can i test if the extrusion does work correctly? ( if i extrude manually, it looks fine)

best regards

8

Watch if the extruder stepper motor stalls or skips during extrusion.
Also check if your extruder steps/mm is set correctly (about 650 steps/mm for the stock extruder)

9

Try this firmware
http://www.k8200.eu/downloads/files/downloads/firmware_k8200_v2.1.1.zip

This version supports the K8204 Z AXIS UPGRADE ROD AND COUPLER FOR K8200 and the VM8201 LCD and SD card controller. DO NOT FORGET TO RESET YOUR EEPROM SETTINGS AFTER THE UPGRADE!. Copyright © 2011 Camiel Gubbels / Erik van der Zalm

10

@ichbinsnur: It was at 600. I increased it 650 and it looks a lot better than in the first picture, but still not “normal” quality.

@Wrong Way: This is exatly the firmware ive installed. To be sure i installed it again ( i also enabled the eeprom chit chat in Configuration.h). But now whe i reset the eepom settings, they are all zero. Can someone maybe post the correct ones?

11

650 is only a starting point.
From there you can tweak it to give best results.

Print a part and increase the flow rate in repetier manual tab every few layers till you get the right extrusion rate.
Then you can set this value as you new extrusion multiplier or multiply your steps/mm by it and set that new value as default in your EEProm.

12

Hi my new test results:

preview2e4b.png2048×1152

left: feedrate = 50
middle: feedrate = 25, extrusion multiplier = 1.6
right: feedrate = 50, extrusion multiplier = 1.6

it seems that the printing quality gets better if i print slower…

13

That is normal.
The faster you print, the more material must be molten and extruded in the same time.
If you print too fast, your extruder/hotend at some point can’t keep up with delivering enough material.
That is why faster printing generally needs a higher temperatures.

It’s also a good idea to use a larger nozzle diameter for really fast speeds like 50 and above.
That’s why i changed to an E3D v6 hotend. It has much better print capabilities overall and a large range ov available nozzle sizes.