breakkid

I've had to change the printer to a different one, this time it is an ultimaker 3. I was able the reproduce the same underextrusion. I tried playing around with the infill line distance. I've noticed that if I change it to 0,48 mm by using a 0,5 mm line width there will be no more bigger gaps in the infill. I changed the infill pattern back to "Lines". I've added another wall, skin wall count to 1, changed back to "infill before walls" and I still had a few small gaps. But at least the lines were touching together at a few points. After using a colder temperature the gaps became again bigger, I've decided then to print with a different PLA and a third Ultimaker 3 (right now I have 6 here in this room) and the gaps were still appearing. So whatever it is: Either my slicing file is not printable or all three ultimakers are underextruding somehow.

How about an extruder calibration?

Took the feeder apart, cleaned IT from some Filament debris and reassembled IT properly. The First part i printed Had underextrusion again. First Pic with 100 infill, second with 80. Changed to the pla/pha. I can Pick the Printer Up, but i cant compare weight wir a force. I have No Feeling for Something Like this at all.

Try this one. https://wetransfer.com/downloads/a734c904a2d38d336f3c2263cf3a8e2a20240112163925/2af281 Screw was in the housing, when I reassembled it. I made every step precisely that was shown in fbrc8's video.

Made a video. There is no way to upload it here... So here is a wetransfer-link. It took the filament 32 seconds to get to the bottom of the beatbed. https://we.tl/t-loI1dPRZHi THere are two specimen I printed again. I changed to 100% flow. THere are still gaps. First one is printed with zig zag, second with lines. Furthermore there is a pic from the feeder and the tension. Its set to middle, but I wonder if this knob is positioned correctly.

I was not able to let it slip. Let's say it that way. I have the same issues with other colorfabb filaments. PLA/PHA and allPHA.

It was cooling down while I was spinning constantly in regular speed. Sorry, but I don't have any feeling for this test. I tried it. I guess it feels right. I really don't know. Unfortunately I don't have any needles here. This is not my printer. I'm at the university right now, because my printer at home is broken. Printcore 1: About 246 meters. Hot since 15 days about. Printcore 2 (BB) was barely used. And there is also the same underextrusion. The Professor know nothing about another printcore being around here.

Right now I#m printing with 0,4 mm line width and I'm still underextruding. With 0° line directions more as with 90°.

The underextrusion is back. Okay, I tried this: Filament is loaded in, i heated material 1 up to 235C, after it reached the temperature, I went to the menu MOVE and started to spin the wheel. The moment I started spinning i started a stop watch. After the filament was in the middle of the way down, 33 sec had passed. I stopped. No. The first layer looks good, after that the problem starts to appear. At layer 3 or 4 maybe it stays in the same quality. Unfortunately not. I've tried this already. The only thing it did was just printing over the holes and making them dissapear. That's not the purpose of the experiment. Parts with holes in it will deliver corrupt data.

Thank you for the answer gr5. Unfortunately I don't know how to measure the force. Actually I had to diassamble it, because there were a lot of filament particles in the feeder. But you are right, I dissasembled it wrong. I just unscrewed the four screws and cleaned everything I could saw. After seeing a video of fbrc8 (I believe she is also a member of the ultimaker community), I cleaned it properly (with the POM gears). Besides that I seemed that the tension screw was in the wrong position, but from the outside it was set in the middle. It seems right now to work better. At least for the moment. I'm working with the ultimaker at my university. The professor could not tell me, if CF-filaments were used with this machine. He just could ensure me that those kind of filament was not used since he started working at the university. The fan is working fine. Unfortunately here is no other "newer" printcore. But I tried printing with the other BB 0.4. I had there the same underextrusion. The first time I made a test print here I had already some underextrusion. Whatever the problem is, it was already existing before I started using the machine. I tried hot and cold pulls. the tip of the filament was clean and nicely conical. I tried the printcore test with 235C and I guess everything was fine. Filament extruded with the MOVE command without any problem.

EDIT: Forgot to mention that with 0,3 mm line width I don't have these problems at all. By turning the angle to 90° no problem aswell. The 0,6 mm line width became better at 90° after reducing the print speed and increasing the flow of the infill which cura usually sets a few percent lower than your "general" flow rate.

Hello, thanks for your fast response. Yes, a small typo. Sorry. haha It appears after leaving the z seam. The flow was calibrated, so the specimen can stay in tolerances I set before for my experiment. Yes, actually the Silk PLA by Colorfabb has a recommended printing temperature from 225-235°C. With temptowers I checked all the temperature settings possible and at this setting it still looked fine. Not even overextruding. And for my design of experiment I need to have two temperature settings (a "colder" and a "hotter" one). The initial layer horizontal expansion was set to a negative value to remove the elephant foot i'm getting while printing seven of those specimen. So far on the first layer with this setting all lines where connecting greatly. I've tried now to print them with the value 0 and the bottom layer is connecting now not even at all.

Hello guys, my name is Damian and this is my first post. There is a problem that I can't solve. I'm printing a lot of impact strength specimen which have the requirement to be solid (100% infill), having a line width of 0,6 mm and a top/bottom & infill line direction of 0°. Other speciment with different setting I had to print were fine, but all those specimen with 0,6 mm line width and top/bottom & infill line direction of 0° were just underextruding. At first I checked max volumetric flowrate, which looked absolutely fine. After that I reduced the print speed from 60 mm/s to 40 mm/s. The lines seemed to look better, but they were underextruding towards one side of the print. I've leveled the heatbed manually. Still the same problem. Then I reduced even to 20 mm/s print speed. Now only 1/4 of the specimen is underextruding. After changing the seam position from back right to back left I discovered that the underextrusion is always moving towards the seamposition. And from this point on I don't know how to continue, Can you guys please help me? I've attached two pictures and the .3mf-file. On the first you can see the underextrusion under a microscope on the second you can hopefully see the gaps growing towards seam position. Sorry for my camera quality (2nd from top printed with 20mm/s). Unfortunately it doesn't get better. I'm slicing with Cura 5.6 and printing on an Ultimaker 3 Extended. I'm using the standard brass nozzle for ultimaker with a diameter of 4 mm. UM3E_impact strength specimen.3mf