I will post the code after work tonight and take a few pictures. The quality of the pictures wont be great as it is hard for me to take good pictures with my non working hands but Ill give it a shot.
I will post the code after work tonight and take a few pictures. The quality of the pictures wont be great as it is hard for me to take good pictures with my non working hands but Ill give it a shot.
I also made some calculations out of the code...
If I assume that the filament diameter is 3 mm, then I get 0.799 mm2 for the sectional area of the extrusion. Great!
However, if the filament is 2.85 mm, then I get only 0.721 mm2, which is 10% less, and looks like under extrusion
For the outer wall, the area is 0,765 mm2, assuming 2.85 mm diameter, so considerably less under extrusion, hence almost not visible.
So, which is actually the diameter of the filament in use?
LE > there is a 0.1 factor that I don't get. The area of a 0.4 mm by 0.2 mm extrusion in 0.08 mm2. I assumed all G parameters are in mm, aren't they?
Ultigcode expresses the E coordinates in cubic mm; the printer firmware takes care of converting them into linear mm of filament to feed in, based on whatever filament size you specify in the machine.
I couldn't get any good pictures with my gopro they all were blurry to the point you couldn't see the gap between infill but here is the 20x20x4 that printed fine
https://www.dropbox.com/s/05jfh5clzyixt76/20mm-cube.gcode?dl=0
Ultigcode expresses the E coordinates in cubic mm; the printer firmware takes care of converting them into linear mm of filament to feed in, based on whatever filament size you specify in the machine.
Aha! Wow, but this means the firmware should be aware of the filament diameter, which is basically a characteristic of the machine, but does not yet have the required constancy over the entire range of manufacturers.
Anyway, then indeed the extrusion is correct in code.
OMG!
Don't tell me this is a sofware fail. Renthal, could you please share the .gcode file? I'd like to print it NOW
Did you get a chance to print my test cube? I'm curious about your results being you liked my post but no reply yet.
Hi Renthal,
I did print it but sadly I used a filament color where it was hard to see if the problem still persists. I have now a longer job running, but I'll try it again after it is finished.
Hi Guys.
That's definitely problem with Cura.
Why the wall lines can touch each other no matter what direction they go but infill lines won't ??
Cura is creating too wide gaps between infill lines and even properly squished lines won't cover those gaps unless you over extrude a lot.
I print mostly with 0.2mm layer hight
I've this issue since I received my UM2
I can achieve all speeds without under extrusion issue, Ultimaker black PLA, 230C, filament diameter set to 2.85
With the same settings two infill lines are about 1.5mm wide (from edge to edge), each line is around 0.55-0.60mm wide, gap between lines is around 0.3-0.4mm (hard to measure to be honest)
It looks like Cura is skipping every second line of infill, you can clearly tell by looking at flat closed surfaces. In my opinion is doing 0.4mm line, then 0.4mm empty space and then another 0.4mm line.
For me only workaround to make those gaps less visible was to set nozzle size to 0.3mm (even if real size is 0.4) or to over extrude by setting filament diameter to 2.65mm instead of 2.85mm which I'am doing right now.
Ultimaker black PLA
Nozzle temp 230
Filament diameter set to 2.65mm
Nozzle size set to 0.4mm (as it should be)
Print speed 40mm/s
0.8mm shell
Can you reproduce this problem with PLA from another supplier?
The reason why I ask is because yesterday I printed with a roll Ultimaker - Ultimate Blue and I had the same problem. But when I print with ColorFabb & Faberdashery I don't have this issue.
As I wanted the Ultimate Blue color I decided to slow down the print from 50mm/s to 30mm/s and increase Expert -> Infill overlap from 15% to 25% and it came out almost perfect.
So I'm not convinced that this is a completely Cura issue, it seems to be material dependent.
I've been suffering from the same problem. I posted in another thread but should have seen this instead. My tests and description is found here: http://umforum.ultimaker.com/index.php?/topic/7401-top-layer-the-distance-between-the-lines-of-plastic/?p=70736
We've seen the same thing with PLA/PHA from colorfabb and with XT as well.
Yes, same issue no matter what filament we use.
Within last month we've tested almost 40 different colours, mostly Colorfabb and Ultimaker, PLA, PLA/PHA, XT, Woodfill Fine and Glowfill.
Some of them flow better than others so problem is more or less visible but still exists.
The best results so far we have had with glowfill and woodfill.
I'm going to test Cura for Windows instead of Mac version just to see if there is any difference.
I just printed Renthals test cube and it looked very nice up until the 4th layer where the lines started spreading again. This also coincided with when the fans started to come on a bit more ...
And here's the picture:
Looks like underextrusion to me. Approx 20-40%. How many layers was the top? Do they get better each time? I'm thinking the top is sagging a bit. It takes a few layers to recover. Maybe 4 to 6 layers. I recommend printing one of these cylinders to test your extrusion:
http://umforum.ultimaker.com/index.php?/topic/4586-can-your-um2-printer-achieve-10mm3s-test-it-here/
This is not underextrusion, not I'm my case anyway.
6, 7 layers for top and bottom, even 100% fill doesn't work, you can always see layers from below between those gaps.
Gr5 could you print simple box yourself and show us your result please.
Well, I've run the test cylinders and get 10 mm^3/s without any problem from 230C and up. At 220 C I get up to 7 mm^3. So I would assume that there is something else at play here?
I've updated UM2 firmware and Cura to 14.09, no difference.
Also tried slicing with Cura on Windows instead of Mac, the same result.
Gr5 could you print simple box yourself and show us your result please.
Second and 3rd photographs here show example of boxes with varying underextrusion. 4th picture shows no underextrusion:
http://umforum.ultimaker.com/index.php?/topic/1872-some-calibration-photographs/
These simple objects were sliced with cura 14.07 a few days ago:
I have had very little trouble filling in the tops of boxes. Unless I was underextruding for some reason.
My problem with the under-extrusion theory is that I can't seem to fill in the top surfaces (or surfaces anywhere in the print) running at 1.6 mm^3/s while I'm able to produce nice extrusion test cylinders at 10 mm^3/2. Would this indicate that there is some other settings then that is causing my under-extrusion problems that is not active when running the extrusion tests?
Something is strange. It could be:
- flow is not set to 100% (check tune menu while printing) on UM2
- diameter of filament doesn't match diameter set on UM2 (e.g. you set 3mm but filament is 2.85mm)
- You didn't use ulticode mode in Cura and set the flow or filament diameter wrong in Cura
- No infill to support top and not enough layers (with no infill you need maybe 1.0mm top/bottom thickness)
- 20% infill selected but not enough top layers (with 20% infill you need maybe .6mm top/bottom thickness)
- infill set to 80% but "solid infill top" or "spiralize" or "only follow mesh" unchecked in Cura expert settings
- infill speed higher than print speed (should be 0 - advanced settings)
- underextrusion (try printing at 240C, .2mm layer, and at 20mm/sec - even a half clogged nozzle should be able to handle this)
- top/bottom thickness is not an integral multiple of layer height (e.g. top layer thickness is 1mm and layer height is .21mm)
- Z stage is moving too far on each move causing mild underextrusion (nozzle too high off part for last layer)
- Z stage steps/mm miscalibrated
- Extruder steps/mm miscalibrated
That's all I can think of right now.
If you send me gcode for 20mm cube (keep it small! - preferably only 10mm tall try to make it under 20 minute print) and post photo of your problems I will print it on my UM2. Post gcode on some web service somewhere and provide a link.
Hi again.
Thanks for all the help. My spontaneous answers that I can give without going back to work is:
- flow is set at 100% (even tried 105% without any change)
- Diameter of filament matches filament (checked with caliper)
- Ulticode is used
- 20% infill and 0.6 mm - 1 mm top and bottom used with 0.1 mm and 0.2 mm layers
I'll check your other suggestions and get back.
Thanks again!
Hi again.
I managed to check my other Cura settings as well:
- Solid infill top and bottom checked
- Spiralize and only follow mesh unchecked
- infill speed 0
I can try the high temperature printing tomorrow morning and see what happens.
If there is a problem with Z-stage or extruder calibration, how is this best tested?
Worked great for me - no holes - 220C:
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I also made some calculations out of the code...
If I assume that the filament diameter is 3 mm, then I get 0.799 mm2 for the sectional area of the extrusion. Great!
However, if the filament is 2.85 mm, then I get only 0.721 mm2, which is 10% less, and looks like under extrusion
For the outer wall, the area is 0,765 mm2, assuming 2.85 mm diameter, so considerably less under extrusion, hence almost not visible.
So, which is actually the diameter of the filament in use?
LE > there is a 0.1 factor that I don't get. The area of a 0.4 mm by 0.2 mm extrusion in 0.08 mm2. I assumed all G parameters are in mm, aren't they?
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