Hi all,
Do check the picture. For many weeks my Wanhao D6 printed perfectly. Then suddenly there was this terrible infill problem. I checked the fans and ordered a new one. But this didn’t help. In fact I tried all the settings for temperature and flow but nothing helps. Whatever I try, I keep getting this troubling infill. Again, it suddenly did not work anymore with the settings that always worked, even on the same gcode. I hope someone can help!
It looks like under extrusion. What changed when this started and don’t say “nothing” because something did. You need to think about it.
Is it new filament, new brand, color? Are you measuring the diameter and entering it into the slicer? What slicer is it?
What is the speed? Do other parts of the print do ok?
First thing you can do is to really watch it print and try to see what is happening. Get right in there and see what it is doing when it has a problem. Can you see how the filament is extruding?
Thanks for your reply! Hope you can help. It does not look like a standard problem.
I have watched the problem many times. Building the bottom layer and the outer edges is ok. First square grid of infill lines is perfect. There seems to be no under extrusion at all at this point. When I use the control panel to eject filament it really is extruding a lot. I also totally cleaned the nozzle. Second layer of infill lines don’t hold on the first ones and holes appear resulting in the messy structure in the picture.
I use the exact same filament as before, fresh Dutch high quality Real Filament PLA 1.75mm. I use both Cura and Simplify3D with the same results every time. Obviously the settings for the filament are correct, also I don’t use any other filament. Different colours, yes, I use eight different colours (black, natural white, orange, pink, red, yellow, gold and satin blue). All the same problem. I read a lot of stories on several forums and investigated underextrusion. So I tested different temperatures and I tested many speeds and flow percentages, according to the advice I found. Nothing worked even a little bit.
So, between the last good print and the first fail a day later, did anything change? No, really didn’t! At least as far as I could see. Same gcode, same filament, same machine, same surroundings, same everything.
I suspect something went wrong with the cooling. Cooling on the D6 does puzzle me. There are stories about red and black connected incorrectly. The construction with the hole in the metal between the two fans seems strange. The fans themselves can only be fitted in one way. I did notice the lower fan not always working (although I set it to 100%) so that’s why I replaced it with a new one. The fans can only be screwed on in one way. But the contacts and which way they should flow, I don’t know. The lower should blow down onto the print I guess. It does not seem to blow a lot of air though.
Does this help?
First and formost…make sure your bed is level. This will cause the filament to jam up in the nozzle.
May I suggest that you run a couple cold pulls of the filament from your printer after you have made sure your bed is level…
For PLA:
-Heat up your hot end to 180
-Let it sit for a minute or two
-Retract the filament to unload it
-Snip off the end of the filament to get a clean end
-Reload the filament
-Heat the hot end to 230-240
-Extrude 50-100mm
-Cool down to 180
-Retract and unload filament again
-Reload filament
You may want to step through this process twice to make sure it’s all cleaned out.
I level the bed before most any print I do. I have removed the nozzzle and cleaned it thoroughly some times.
I tried the instructions and noticed a very thick line of filament coming out of the nozzle. Then I printed the same test piece, sadly with the same horrible result.
Can anyone check in what direction their two fans are blowing on the D6? Thanks!
To make sure the settings are ok I tried to print the hand gcode that came with the machine and was my first perfect print. It failed.
Just ordered two new nozzles to make the problem is not in the nozzle. Any advice on the fan flows, please let me know!
Since the problem is still happening on the same gcode, that probably means that there is a problem with the physical calibration of the printer. try re-leveling the bed, and do a good cleaning of the hotend. If that still doesn’t work, try a new roll of filament. Over time, pla and abs can absorb moisture and get old/brittle.
Thanks but already done all of them.
Received new nozzles today, fitted one and did a test print. Perfect!
