I’m having weird " blowouts" looking surface on my prints, can’t figure out why it’s happening.
The part has a shell with a 2,4mm thickness. The " top" which is not a top surface because it’s at a 5 degree slope, it’s a outer wall surface.
It’s printed with support and still comes out like this,
Is it a filament fault,sparse infill or internal fill problem?
Im using fiberlogy PETG transparent with 0.1 layer hight.
Welcome to the forum.
Since it is PETG I would want to make sure it is dry first. Did you dry it?
This looks like a small part, are you printing it by itself? I would suspect min layer time possibly being an issue if so, I would want to print at least two at a time. I know the filament profile has a setting for min layer time so possibly just adjust that or you could slow down the wall speeds.
Thank you!
I baked the spool in the oven with fan turned on in 3 h at 60°c before printing.
Yes it’s a fairly small part, 75x32x22mm.
Yes I print one at the time, I will try print 2 at the same time.
So you mean in " part cooling fan " “min print speed”?
I’ll see how it goes to print 2 at the same time.
Thanks
3h at 60c isn’t enough. If you are drying on an oven make sure convection is on and dry for 6-10h
Here is the area of concern for min layer time:
When ‘slow printing down for better layer cooling’ is checked the layer will need to take at least as long as the ‘Max fan speed threshold>Layer time’, so that is what you would turn up in seconds so it is forced to take longer.
Printing two at the same time will double the current layer time you have been experienced so this will be a good test either way.
This type of defect frequently occurs as a result of solid infill edge curling.
Thoroughly dry your filament (!!!), print with a warm chamber (while avoiding clogs), dare to go slower (I use <100mm/s for PETG Basic) and use adaptive layer height.
This may not be enough to solve the issue fully, but it’ll be significantly reduced.
For rather small parts, min layer time can be an issue and have effects contrary to the intention. As @Lenyo mentions, printing 2 parts is much more effective in these cases.
I think I found the problem, the nozzle was at 270mm/s when printing sparse infill. I saw the nozzle Turing upp the layer(going to fast). And later when the outer infill comes over printing it covers the defect.
Besides that, I tried printing 2 at the same time, witch resulted in better consistent wall quality, and a slightly better " top surface ", besides the sparse infill being slugged.
As you can see on the image, the top most is the first one I made when posted, the other 2 is freshly made.
Adjusting layer speed also had a positive effect!
I’m going to try slow down sparse infill + internal solid infill to see if works out better not pulling up filament.
I use 75mm/s on inner/outer wall.
I’m going to invest in a filament dryer😅
