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Cooling issue?  

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ventrue3000
(@ventrue3000)
Active Member
Cooling issue?

When I print large, thin-walled objects like boxes, they end up looking like this. Smaller objects are fine. This is PLA, printed on the MK4 inside the enclosure. Since it's PLA, I've got the left door open while printing, but other than that I'm using the same settings as usual.

I can live with the inner structure showing on the outside if necessary, but I'd like to get rid of these rough surface defects and the fur-like stringing that's coming out of the surface. My guess would go in the direction of a temperature issue, does that sound reasonable? How much have you guys adjusted the settings after putting the printer in the enclosure?

Respondido : 31/05/2024 11:12 am
Diem
 Diem
(@diem)
Illustrious Member

Please save your project as a .3mf file

Files > Save Project as

Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.

Cheerio,

Respondido : 31/05/2024 5:11 pm
ventrue3000
(@ventrue3000)
Active Member
Topic starter answered:
RE: Cooling issue?

Sure, there you go:

Project

There are two files in there, the first one has the model on the picture above. The second one has slightly different settings and looks better so far, but it's not done yet. Reducing bed temperature by a lot has led to warping, so going much lower with that is not an option.

Respondido : 01/06/2024 12:08 am
ventrue3000
(@ventrue3000)
Active Member
Topic starter answered:
RE: Cooling issue?

This is the result of the second project file. Certainly a lot better already. The slightly more shiny layers (bottom half of the print) are also printed at 50% speed.  The least shiny layers (at the top) are printed at 150% speed.

 

Respondido : 01/06/2024 5:25 am
Diem
 Diem
(@diem)
Illustrious Member

You have two underlying issues; your filament is damp - dry it, and your box walls are too thin for neat printing.

At 0.8mm thick with your default extrusion width of 0.45mm your two strand thick walls do not leave room for any variations as the water in your filament boils.  Arachne cannot compensate.  The print-through is another side effect.

For clean vertical wall printing you need to leave room for at least 5 extrusions, around 2mm thick.  For structures like this the Classical perimeter engine is usually better than Arachne.

Cheerio,

Respondido : 01/06/2024 12:20 pm
ventrue3000 me gusta
ventrue3000
(@ventrue3000)
Active Member
Topic starter answered:
RE: Cooling issue?

Interesting thought with the classical engine, I'll give that a try!

There's a bit of irony in printing a drybox with filament that's too wet, isn't there? 😛

Respondido : 02/06/2024 4:00 am
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