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

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...

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.

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

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.

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.

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.

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 🙂

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.

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. 

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

This is my goto stuff LINK

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

@szumi

I use eSun it's very good cleaning filament.

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

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

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.

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 

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.

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,

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.  

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.