Help with 0.8 AA Core

[Travis7s 26]

UM3. Cura 4.6.1 UM Nylon

 

We print all the time with nylon with the 0.4AA core and it works great. To try and save time on some simple flat pieces I switched to the 0.8AA core which we've never really used. Using the stock profile it came out quite ridiculously bad, although the preview in Cura looked good. Is there something special I should be doing to try and improve this? I've attached a photo of the 0.4 vs 0.8 parts for reference.

[Carla_Birch 116]

Hi @Travis7s

 

Did you up the temperature settings to a higher temperature at all? When using the 0.8AA you are trying to push out a lot more filament at once, so you need to set a higher temperature so the printer can keep up with melting it in the print core.

 

It looks like its been having a hard time flowing out the nozzle so my guess is that you do need to higher the printing temperatures.

[UlrichC-DE 114]

One more idea
I'm printing that right now, too. With a similar printer (UM5). With a normal profile in the only available -quickly- without changes. It looks okay so far.

 

Never really used means already used but packed again?
If the printing doesn't work I will do it anyway. Unpack things to find out if it's something else.
Sometimes I have two things that do not work. But also happy with it.

 

You hear a retract on the feeder?
Tock / Tock sometimes means nozzle clogged.

 

[Travis7s 26]

Thanks for the replies. Unfortunately priorities have already shifted with me so I need to back to 0.4AA and won't be able to troubleshoot for another week or so. 😞

I did notice some things though.

 

The stock profile for 0.4AA Nylon is 255C, while for 0.8AA it is only 245C which seems against what Carla is saying.

 

I think I may have found the real problem though, on closer look I can see that the nozzle is way too high off the plate. I realize now that I swapped cores without doing any kind of calibration or leveling offset for the 2nd nozzle so...

 

 

[Carla_Birch 116]

3 minutes ago, Travis7s said:

Thanks for the replies. Unfortunately priorities have already shifted with me so I need to back to 0.4AA and won't be able to troubleshoot for another week or so. 😞

I did notice some things though.

 

The stock profile for 0.4AA Nylon is 255C, while for 0.8AA it is only 245C which seems against what Carla is saying.

 

I think I may have found the real problem though, on closer look I can see that the nozzle is way too high off the plate. I realize now that I swapped cores without doing any kind of calibration or leveling offset for the 2nd nozzle so...

 

 

 

Yeah in Cura for the profiles they seem to drop the print speed down a lot what has the same effect of printing higher temp. Basically by them dropping the print speeds for the 0.8 vs the 0.4 it lets the printer keep up with melting the fillament. EG 0.4 is 70 mm/s where 0.8 is drops to 35 mm/s so in many cases using a 0.8AA use the preset profiles might be slower than using a 0.4 as the print speeds half.

[Travis7s 26]

Even at half the speed a 0.8AA nozzle can finish these particular parts 3x as fast. It would definitely be worth it if I can get the quality right, I can only fit 6 of these on the build plate at a time.

[Carla_Birch 116]

Once you have done your nozzle height if you still have the same problem I would personally up the temperature as it really looks like you have under extrusion, going by how thin the lines looks and the gaps between them.