PETG printing inaccurately, tried all the basic calibration and I'm still stumped
 
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PETG printing inaccurately, tried all the basic calibration and I'm still stumped  

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Alyssa
(@alyssa)
Eminent Member
PETG printing inaccurately, tried all the basic calibration and I'm still stumped

I've posted this on FixMyPrint, but as I've gotten no replies I honestly am kinda stumped in this print. I've been printing with PrusaSlicer on Overture PETG. I'm using 240C/90C temperature (I know this is a bit high, but I'm trying to print final model in Transparent, and from what I understand this requires a bit higher temps)

I'm printing really slowly, at 30mm/s for perimeters, and I've calibrated z as well as I think I could. for retraction, using 3.5mm at 70mm/s, and it seems to minimize stringing well enough.

I'm trying to fix issues shown in the images, which are mostly hard inaccuracies on overhangs and generally smoothing out walls. I'm not sure what's been causing this, but it seems like there's just one singular thing that could get it well-calibrated enough and yet it looks kinda lackluster now. Any help would be appreciated. Thanks y'all!

P.S. I'm aware that it could be the fact that the filament is wet, and I've tried to remedy this using a filament dryer. However, it seems it can only run at 55C (was running for 8 hours at the start of the print), and I've googled that PETG should be heated at around 65 for 4 hours. If this is the problem, I'm not sure what else to do other than stick it in an oven and am totally open to suggestions 🙂
Respondido : 04/11/2021 6:53 pm
Diem
 Diem
(@diem)
Illustrious Member

You have already identified a significant issue here; yes, if you have an accurate oven, stick it in there.

OTOH I use a food dehydrator for which I have printed an extra, filament-spool sized layer and that can go high enough.

Cheerio,

Respondido : 04/11/2021 7:54 pm
Alyssa
(@alyssa)
Eminent Member
Topic starter answered:
ahhh okay

I see, that's somewhat unfortunate; I was skeptical of buying an offbrand filament dryer but I didn't realize what the problem was til now. Do you mind recommending me that food dehydrator that you have? I would prefer not to use an oven as that just seems like overkill and also might contaminate food also used in that oven? I really appreciate it tho

Also, would I happen to have any other glaring problems that would improve the print quality?

Respondido : 05/11/2021 12:08 am
Diem
 Diem
(@diem)
Illustrious Member

Do you mind recommending me that food dehydrator that you have?

https://www.amazon.co.uk/HOMCOM-Dehydrator-Adjustable-Temperature-Control/dp/B01N8OWBLQ/ref=sr_1_5?crid=YLPBZLC5NVD8&keywords=dehydrator&qid=1636119085&sprefix=dehy%2Caps%2C73&sr=8-5

I didn't do much research - just picked one that used up the remaining credit on a gift-card.

You can either snip out the bottom of a couple of trays to make room for a filament roll or do what I did and print a tall spacer.  A translucent PETG spacer has worked OK for me so far...

Attached is a file that should fit a Mini, print three and glue together to make a spacer.

CAVEAT: This is untested, I have a MK3 and made my spacer in two parts.

prefer not to use an oven as that just seems like overkill and also might contaminate food

Most of our filaments can be made food safe and the main issue is usually bacteria on food remnants trapped between layers when a plastic container or implement is used a second or subsequent time.

There is very little that you would bake at the same temperature so I have no qualms in drying filament in the oven or in drying food in the same dehydrator; just not at the same time.

any other glaring problems that would improve the print quality?

Hard to say as the uncontrolled expansion as water boils off masks a lot.

Cheerio,

Respondido : 05/11/2021 2:35 pm
Alyssa
(@alyssa)
Eminent Member
Topic starter answered:
RE: PETG printing inaccurately, tried all the basic calibration and I'm still stumped

this is super helpful; will totally look into making the insert and getting this dehydrator instead. I'm pretty sure it makes it much worse that I live in Florida, so this will absolutely come in handy lmao

Respondido : 07/11/2021 3:44 am
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