Holes in support columns with Polyterra PLA on Bambu X1C | Polymaker (3D Printing) | Page 1

magic sparrow Jan 2, 2023, 10:39 PM

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This print is currently still going. What would cause the holes in the tree supports? I am printing with Polymaker Polyterra PLA and using that profile in Bambu studio. Using 0.2 standard profile with only change being supports turned on and set to Hybrid. In my Preview I had the warning: "Empty layers around bottom are replaced by nearest normal layers". Could that be the cause of the holes in my supports? I did not totally understand the error.

So far the model appears to still be printing fine, I do not see any holes in the model itself just in the supports. I will know more once it finishes printing 4.5 hours from now and can examine the actual model.

honest zephyr Jan 2, 2023, 10:57 PM

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magic sparrow This print is currently still going. What would cause the holes in the tree supp...

It's possible you are exceeding the maximum usable flow for the filament, I think the polyterra profile is too aggressive

magic sparrow Jan 2, 2023, 10:58 PM

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The rest of the model seems fine (will know more when it completes). Would an over aggressive flow impact the supports first before the model?

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Where is Flow in the settings? Is it under speed and you slow it down?

vapid gyro Jan 2, 2023, 11:12 PM

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So the supports only having 1 or 2 walls causes this bit it isn’t bad. They normally print just fine and they are so each to break off lol

honest zephyr Jan 2, 2023, 11:16 PM

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magic sparrow Where is Flow in the settings? Is it under speed and you slow it down?

Volumetric flow in the filament settings

magic sparrow Jan 2, 2023, 11:18 PM

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honest zephyr Volumetric flow in the filament settings

What would you recommend?

honest zephyr Jan 2, 2023, 11:20 PM

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16-18

magic sparrow Jan 2, 2023, 11:20 PM

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vapid gyro So the supports only having 1 or 2 walls causes this bit it isn’t bad. They norm...

I want the holes after it is done not before 🙂
It does seem to be surviving the print despite these holes though. I won't know until it finishes. I am shocked it has not gone spaghetti with some of these holes.

honest zephyr Jan 2, 2023, 11:20 PM

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Remember, pushing any filament to it's limits might cause issues. So I like to dial back the max flow to prevent any problems

magic sparrow Jan 2, 2023, 11:23 PM

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honest zephyr Remember, pushing any filament to it's limits might cause issues. So I like to d...

OK, thanks. I will give that a try. Is that the only change I need to make? Will everything else compensate for the new volumetric speed limitation?

And just so I understand, basically what is happening is the device is underextruding at certain points where it is moving fast. It might only be showing on the supports because those are meant to be thin/breakable so underextrusion on the walls might show as a hole whereas on the actual model there are thicker walls? Am I understanding that correctly?

honest zephyr Jan 2, 2023, 11:27 PM

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magic sparrow OK, thanks. I will give that a try. Is that the only change I need to make? Will...

Supports will almost never look clean, as long as they make it to the top. An overall issue with polyterra is bambu's aggressive profile for it

vapid gyro Jan 2, 2023, 11:35 PM

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magic sparrow I want the holes after it is done not before 🙂 It does seem to be surviving the...

Cura tree supports do the same thing. It looks worse than it is lol

magic sparrow Jan 2, 2023, 11:41 PM

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Interesting, in the past my supports have looked really clean. Even using the Polyterra PLA I had not had support holes. I did have some other model failures but I think it was due to the model having issues.

full saddle Jan 2, 2023, 11:46 PM

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Just jumping in to add that I use the generic pla settings for polyterra with no issues. I'd have to look at the profile to see the numbers but I'm about 24 hours in to a 50 hour print using marble polyterra pla, christmas gold (pla pro?) and PLA pro silver and colums and print look amazing.

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I also am using the new tree light supports from bambu slicer 1.4.1

magic sparrow Jan 3, 2023, 1:47 AM

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full saddle Just jumping in to add that I use the generic pla settings for polyterra with no...

I checked and the generic PLA profile has a volumetric rate of 12 compared to 22 for the Polyterra profile.

honest zephyr Jan 3, 2023, 2:07 AM

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magic sparrow I checked and the generic PLA profile has a volumetric rate of 12 compared to 22...

Exactly, it's pretty high and doesn't print/cool well at that flow

magic sparrow Jan 3, 2023, 2:25 AM

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Here is the final model. Came out pretty good despite the supports having holes. I could not detect any problems on the model except where the supports attached to the model which usually happens no matter what. 6.5 hours to print. Star Trek DeepSpace9 spaceship.