joerg.e
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Cooling Problem? Need some help.

Fri May 18, 2018 9:43 am

Hello

I have a problem i cannot identify…

1. I own a Prusa Mk3
2. a few days ago i updated to latest published Firmware 3.2
3. checked everything if its correct (Live Z, Extrusion…) = it is (see 25mm Cube MattsHub is using as an example attachment)
4. I printed a normal Benchy (see attachment, pretty ok)

5. Now i wanted to print something new (never printed before, so no examples from very good working firmware before) - large light bulb: https://www.thingiverse.com/thing:2280081
a) I got very bad results, and i do not know why. I sliced with (S3d, Slic3r 1.39.1, 1.39.2, 1.40.1a) but its everytime nearly the same result (see picture(s) for the base i printed - Bulb base, 3 Bulb bases).

b) i experimented with different filaments, extrusions etcpp. All parameters are correct (filament diameter too)
6. Because i thought its maybe the thingy i tried to print something different (Bathtub):https://www.thingiverse.com/thing:2631794
But it came out bad too. See at the Bottom and on the top.
Bathtub_Frontview.jpeg
Bathtub Frontview
Bathtub_Frontview.jpeg (888.26 KiB) Viewed 155 times
Bathtub_sideDown.jpeg
Bathtub side down
Bathtub_sideDown.jpeg (1.37 MiB) Viewed 155 times
Bathtub_back.jpeg
Bathtub back
Bathtub_back.jpeg (1.15 MiB) Viewed 155 times
I used standard Parameters for slicer (PLA, 210/60, Fan to 100% from Layer2, 2 and 3 Perimeters (tested both), not too fast (standard Prusa), 0.2 Layer Height).
Yes, all parameters like skew, belt etc are fine and checked..

What might be the problem? Is it a cooling problem? Do i need a different shroud? Whats your experience with that Thingies?
Do i need a sock for my E3d?

with the old(er) Firmware it printed like a champ.

best regards
Joerg
Last edited by joerg.e on Fri May 18, 2018 10:28 am, edited 1 time in total.

joerg.e
Posts: 7
Joined: Thu Oct 05, 2017 1:13 pm
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 9:44 am

I do not know the reason but i was able to add 3 attachments only :-(
Benchy.jpeg
Benchy.jpeg (1.32 MiB) Viewed 154 times
Bulb_Bases3.jpeg
Bulb_Bases3.jpeg (1.19 MiB) Viewed 154 times
Bathtub_top.jpeg
Bathtub_top.jpeg (609.37 KiB) Viewed 154 times

joerg.e
Posts: 7
Joined: Thu Oct 05, 2017 1:13 pm
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 9:45 am

Bulb_base.jpeg
Bulb_base.jpeg (1.03 MiB) Viewed 154 times
The last one, sorry, for so much messages..
Joerg

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Knickohr
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 11:11 am

Image

This looks strange ! It seems your layers-perimeters are twisting :o

Did you print outer perimeter first ?

Slic3r, Print Settings, Layer and Perimeters, Advanced, External Perimeters first ?

Maybe the overhangs are to big ?

By the way, you can only post 3 images in one post, it's limited by the fourm settings.

Thomas

joerg.e
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 12:53 pm

Hi Thomas

>Did you print outer perimeter first ?
>Slic3r, Print Settings, Layer and Perimeters, Advanced, External Perimeters first ?

No. Its not set.

>Maybe the overhangs are to big ?

I do not know. Hoped, that someone other may have had experience with the bathtub or the bulb (bulb is faster to detect if its going wrong).
Maybe someone is able to test the bulb base.

bytheway. with he same settings cubes, benchy and other things are not an problem...

>By the way, you can only post 3 images in one post, it's limited by the fourm settings.

Ah ok, that explains it. Thanks.

Joerg

ray.a2
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 1:39 pm

From the prints I was getting, I believe that the stock prusa part cooling nozzle mainly blows air from the front, causing the back to not be properly cooled.

I printed a different fan shroud and am much happier with the backs of prints now.

https://www.thingiverse.com/thing:2873477

I also adjusted my PLA to a bit lower temp of 206, which helps with bridges and overhangs.

Hope that helps.

joerg.e
Posts: 7
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 2:04 pm

ray.a2 wrote:
Fri May 18, 2018 1:39 pm
From the prints I was getting, I believe that the stock prusa part cooling nozzle mainly blows air from the front, causing the back to not be properly cooled.

I printed a different fan shroud and am much happier with the backs of prints now.

https://www.thingiverse.com/thing:2873477

I also adjusted my PLA to a bit lower temp of 206, which helps with bridges and overhangs.
Hello

I am not sure, if its cooling problem or not. Are you able to check and print that bulb base with your printer?
My temp for PLA is already 205 for the second layer and above.

I assume i have to print the shroud in petg (which i do not have at the moment).
Did you compared your mentioned shroud to that one? -> https://www.thingiverse.com/thing:2740613

Joerg

gert.l
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 2:08 pm

I assume i have to print the shroud in petg (which i do not have at the moment).
The shroud should be in ABS, PETG will droop after a while.
PRUSA delivers the fan shroud printed in ABS.
---
Gert

ray.a2
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 2:57 pm

joerg.e wrote:
Fri May 18, 2018 2:04 pm

Hello

I am not sure, if its cooling problem or not. Are you able to check and print that bulb base with your printer?
My temp for PLA is already 205 for the second layer and above.

I assume i have to print the shroud in petg (which i do not have at the moment).
Did you compared your mentioned shroud to that one? -> https://www.thingiverse.com/thing:2740613

Joerg
Joerg, sure, I can try the bulb base and post a pic.

I did not try the JLTX shroud, no. The one I posted was a direct fit in place of the stock prusa.

As gert.l mentioned, you should print it in ABS as PET will melt after a bit or with longer run prints. Definitely do not use PLA.

If you are having issues with printing ABS, then you could print a throwaway in PET to test and see if your print is any better.

joerg.e
Posts: 7
Joined: Thu Oct 05, 2017 1:13 pm
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Re: Cooling Problem? Need some help.

Fri May 18, 2018 9:03 pm

ray.a2 wrote:
Fri May 18, 2018 2:57 pm
Joerg, sure, I can try the bulb base and post a pic.

I did not try the JLTX shroud, no. The one I posted was a direct fit in place of the stock prusa.

As gert.l mentioned, you should print it in ABS as PET will melt after a bit or with longer run prints. Definitely do not use PLA.

If you are having issues with printing ABS, then you could print a throwaway in PET to test and see if your print is any better.
That would be good to see someone other printing that. Thanks in advance.

In the meantime i tested PLA with and without LA. But no difference.

Joerg

ps.: will try to print one shroud in PET the next days.

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