Switched from black petg to white petg, keep getting black chunks hours later
 
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Switched from black petg to white petg, keep getting black chunks hours later  

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Szumi
(@szumi)
Active Member
Switched from black petg to white petg, keep getting black chunks hours later

I'm trying to figure out what is going on.  I mostly print with black petg but last night I was printing a box for an allsky camera and switched to white petg.

The first session had crash detection causing a rehome a couple times until I realized that chunks of black was causing issues with a good first layer.  I restarted the job and it did finish 8 hours later but I see spots where black filament is in the part hours later.

Educate me, where is that old filament hiding, how to I do a switch over from light to dark w/o the previous filament coming out at random.

Thanks,

Szumi

 

Posted : 21/05/2022 7:31 pm
JustMe3D
(@justme3d)
Reputable Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

How to? Unload old filament, load new filament, keep on printing; that´s all there is and there should be no visible contamination with old filament. If you have dirt in your prints, check whether there is dirt sticking to the outside of the nozzle or heatblock which peels off over time...

I try to give answers to the best of my ability, but I am not a 3D printing pro by any means, and anything you do you do at your own risk.

Posted : 21/05/2022 9:45 pm
fuchsr
(@fuchsr)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

What JustMe3D said. PETG is notorious for sticking to the nozzle and/or heater block. I tend to give them a good scrub with a soft wire brass brush while the printer is waiting to reach proper temperature.

I would add, that when switching from darker to lighter colors, I usually run two or three extra purge cycles (answer no when prompted if color is correct), or run a length of cleaning filament through it.

Posted : 21/05/2022 11:26 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

@szumi

 

It's possible that some of the black filament could be stuck in the teeth of your bondtech gears, even if its not visible on the gears, if you had periods where the gears were grinding on the filament that would leave particulate inside the feed area. When was the last time you cleaned the gears and feeder area?

@fuchsr advice is also good and I do the same.

 

Regards

 

Swiss_Cheese

The Filament Whisperer

Posted : 22/05/2022 1:18 am
jsw
 jsw
(@jsw)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

I always make it a habit to purge thoroughly when switching from a darker filament to a lighter filament, and then brush off the nozzle with a soft wire brush right before each print.

'Boogers' of old and/or scorched filament may cling to the nozzle and break off at any time.

Now if the filament is leaking around the heat block, that's a more serious issue.

Posted : 22/05/2022 2:18 am
raew
 raew
(@raew)
Eminent Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

 

Posted by: @fuchsr

What JustMe3D said. PETG is notorious for sticking to the nozzle and/or heater block. I tend to give them a good scrub with a soft wire brass brush while the printer is waiting to reach proper temperature.

I prefer a nylon brush over a brass brush, to avoid accidentally creating an electrical short.

Posted : 05/06/2022 6:53 pm
towlerg
(@towlerg)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

 

Posted by: @raew

 

Posted by: @fuchsr

What JustMe3D said. PETG is notorious for sticking to the nozzle and/or heater block. I tend to give them a good scrub with a soft wire brass brush while the printer is waiting to reach proper temperature.

I prefer a nylon brush over a brass brush, to avoid accidentally creating an electrical short.

I don't think a nylon brush is going to do much. Provided you only brush the underside of the heatblock and the nozzle you will not cause a short.

Posted : 06/06/2022 12:09 pm
raew
 raew
(@raew)
Eminent Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

 

Posted by: @towlerg

 

Posted by: @raew

 

Posted by: @fuchsr

What JustMe3D said. PETG is notorious for sticking to the nozzle and/or heater block. I tend to give them a good scrub with a soft wire brass brush while the printer is waiting to reach proper temperature.

I prefer a nylon brush over a brass brush, to avoid accidentally creating an electrical short.

I don't think a nylon brush is going to do much. Provided you only brush the underside of the heatblock and the nozzle you will not cause a short.

Works sufficiently well for me. And even if the brass brush would work a tad better, the peace of mind of not having to be super-careful where to put the brush (and where not to) makes it totally worth it for me 🙂

Posted : 07/06/2022 11:17 am
oriddlero
(@oriddlero)
Eminent Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

Just run 8 inches or so of cleaner filament through it ~20°C hotter than whatever your previous filament was printing out. Done.

Posted : 01/07/2022 7:10 pm
Szumi
(@szumi)
Active Member
Topic starter answered:
RE: Switched from black petg to white petg, keep getting black chunks hours later

I didn't know they made cleaning filament.  I'll get some along with a brush to clean the body. 

Posted : 01/07/2022 8:26 pm
oriddlero
(@oriddlero)
Eminent Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

This is my goto stuff LINK

Posted : 01/07/2022 10:06 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

@szumi

 

I use eSun it's very good cleaning filament.

The Filament Whisperer

Posted : 01/07/2022 10:15 pm
fuchsr and oriddlero liked
oriddlero
(@oriddlero)
Eminent Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

Yeah that's the one i linked him to above 🙂 

Posted : 01/07/2022 11:14 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

I never checked the link sorry, I don't know what country amazon.to is I just tell folks what I use and let them look it up, I don't have affiliate links.

The Filament Whisperer

Posted : 02/07/2022 2:09 am
oriddlero
(@oriddlero)
Eminent Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

The link I posed was for the eSun cleaning filament on Amazon (it's what i use) in the United States, i'm not sure where he is from or if he has access to Amazon 

Posted : 02/07/2022 2:26 am
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE:

i'm not sure where he is from or if he has access to Amazon 

Me either, that's why I post the product name and maybe a link so they can at least see what the product looks like. e.g. I've tried to recommend Windex to folks here before, and not only did  they not initially know what Windex was, but they couldn't afford to get it in their country. So I try to keep that in mind when I suggest product. Also sometimes they don't feel comfortable clicking a link they don't know.

 

International  Forum.

This post was modified 5 days ago by Swiss_Cheese

The Filament Whisperer

Posted : 02/07/2022 3:10 am
Diem
 Diem
(@diem)
Famed Member

We don't have Windex here either afaik, but cheap, own brand, window cleaner from at least two UK supermarkets works OK. 

Post and packing for a bottle of Windex would probably cost many times the product price.

Cheerio,

Posted : 02/07/2022 10:16 am
Szumi
(@szumi)
Active Member
Topic starter answered:
RE: Switched from black petg to white petg, keep getting black chunks hours later

I'm in the USA.   The .to domain looks to be Tonga or someone in Toronto.  For whatever reason my ISP used .CC for my email which is the Cocos (Keeling) Islands near Australia.  

 

Posted : 02/07/2022 12:13 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Switched from black petg to white petg, keep getting black chunks hours later

That's really strange, because I'm in the US and my non affiliate linked URL's look like this.

https://www.amazon.com/eSUN-Cleaning-Filament-Extruders-Clogging/dp/B08RSCP95X/ref=sr_1_3?crid=GAHKGR4AR3WD&keywords=esun+cleaning+filament&qid=1656824109&sprefix=esun+cleaning%2Caps%2C122&sr=8-3

 

Let me know if it shows I'm in Zimbabwe.

The Filament Whisperer

Posted : 03/07/2022 4:59 am
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