Prusa XL "Nozzle Cleaning Failed" very common - PETG  

RE: Prusa XL "Nozzle Cleaning Failed" very common - PETG

I'm not sure what you mean by "nozzle cleaning fail."

You might want to give more info, such as the nozzle size.  I say that because of an unexpected issue I had with PETG: PETG was working fine for me with 0.4mm nozzles, but when I changed toolhead 5 to a 0.6mm HF nozzle the PETG wouldn't stick to the build plate at all.  Increasing the bed temperature and the nozzle temperature solved that problem, so I created a new higher-temperature filament profile for PETG on the 0.6 nozzle and it's been fine since.

RE: Prusa XL "Nozzle Cleaning Failed" very common - PETG

I run almost exclusively Hatchbox Black PETG.  I run it directly from my filament drybox and it is super clean.  Yes a little wipe of the nozzle at the start of the print after it reaches 170 with a microfiber cloth, but that's it.

The temp before printing by default is only 170 and it shouldn't be oozing at that temp unless it's not dry.

I use the Prusament PETG profile and that works very well. 

On prints that take up a lot of space on the bed you might get some buildup on the nozzle when printing the first few layers, but it should stay clean after that.

How come you can't reach the nozzle?  If you want to clean it manually set the temp to 230, and then use the control menu on the printer to pick the extruder you want and then use the move command to bring it to the front of the printer, and move the z height to get rbed out of the way.  Let it ooze for a few minutes then clean it with a brass brush and a microfiber cloth 

As for running from the drybox I bypass the side sensor and ran new tubes directly from the extruder to the drybox using 3mm id tubing instead of the 2mm id factory tubing and made a gently curving path so that it minimizes drag. 

The only downfall to this setup is that when the filament runs out you have to disconnect the tube from the extruder to get the small leftovers piece of filament out but it's no big deal. Been running this easy from day 1 and it works great. 

RE: Prusa XL "Nozzle Cleaning Failed" very common - PETG

.06 nozzle setup

I have a dryer but not sure I have the space to do it. https://www.amazon.com/gp/product/B0BM97WX1D/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
I have the 5 head and will do multi PETG prints. But for just nozzle 1 with PETG print I could try to build something that would hold the dryer. Printer takes up the whole dang table and the dryer can get pulled around. I would need to figure this out and pin it down with easy ability to pull in to the printer.

This oozing happens when i open a brand new spool btw. People have said out of box can be wet, but thought I'd still mention that.

There are times where the nozzle is super close to the bed and far back so the only thing I have that can reach is a very long box razor. But when I can get to it better I use other tools that are much nicer to clean it.  This is during various instances of running like heat absorb or whatever. Some of them involve being close and back where I can't get brushes or tools in there. After a fail I can reach. But in other cases its tight.

I don't know how to bypass the side sensor.

I always run Generic PETG. I will try Prusament PETG setting.

People have posted code in other threads. I just need to know how to activate that in Prusaslicer to run startup colder.  When that is done there are good results for stopping the oozing. I've heard of very good results, I just don't now how to do it. Its a bit cryptic to me at this moment.

thanks

RE:

If you've ever seen a filament production setup (there's vids on the internet) they often involve running the filament through long troughs of water before spooling it.  Now, maybe that doesn't hydrate the filament much, or maybe the manufacture bakes it to dehydrate it afterward, but with that and everything else, I always dry out new filament in a dryer and then store it in a drybox.

With a 0.6mm nozzle, definitely try elevating your temps.  I was using Jessie PETG, which Prusa has a profile for (naturally, seeing that they own Printed Solid now), but I still had to increase the bed temp to 90C for the first layer/ 85C others,  and increase the nozzle temp to 250 to get it the PETG to stick to the bed

Also, note that you can put the extruder anywhere you like at any  temp you want for cleaning using the front panel "control" menu.  You can pick a tool, then set the X, Y and Z axis to whatever you want, then set the extruder temp.  SO just bring the extruder up to front-and-center, drop the bed out of the way, heat up the nozzle and clean away!

RE: Prusa XL "Nozzle Cleaning Failed" very common - PETG

Fresh out of the bag is rarely dry for me.

You can turn the side sensor off in the menu or just stick a piece of filament in it.  I 3d printed some plugs for it.  The sensor on the head still works when the filament runs out.

RE: Prusa XL "Nozzle Cleaning Failed" very common - PETG

Hah putting filament in it, nice.

I have just been storing filament in vaccum style bags with those lil packs in them. Its not the best thats for sure. I'm printing so much lately that the stuff just sits on the printer. I'm burning through PETG a lot.

PCGEEKSQ - The printer prints great after the nozzle cleaning. usually. Often if I get past that its usually good. if a first layer fails, often an iso wipe fixes it.
I'm just trying to stop the oozing that happens in between prints / leading up to it during all its many lil funky phases it goes through.   

I'm not familiar with dryboxes at all.  Again i'm ripping through PETG so fast for weeks now that I just open the stuff up and put it on and go.

I can try putting the upcoming spool inside the dryer and see if i have better results.

RE: Prusa XL "Nozzle Cleaning Failed" very common - PETG

There's not much of there besides diy ones with desiccant unless you want to spend a grand. 

I actually bought an electronics drybox for about 400 and just altered it to have filament rollers inside it. I print directly out of it and it holds 6 rolls for active printing and 3 additional for storage. 

It has a electronic dehumidifier and it stays at around 15% relative humidity.  If I need to print right away with a new roll I dry it in a dryer first then put it in the drybox.  If I plan ahead new rolls go directly into the drybox and by the time I need them they are dry. 

RE:

Posted by: @revel

Hah putting filament in it, nice.

I have just been storing filament in vaccum style bags with those lil packs in them. Its not the best thats for sure. I'm printing so much lately that the stuff just sits on the printer. I'm burning through PETG a lot.

PCGEEKSQ - The printer prints great after the nozzle cleaning. usually. Often if I get past that its usually good. if a first layer fails, often an iso wipe fixes it.
I'm just trying to stop the oozing that happens in between prints / leading up to it during all its many lil funky phases it goes through.   

I'm not familiar with dryboxes at all.  Again i'm ripping through PETG so fast for weeks now that I just open the stuff up and put it on and go.

I can try putting the upcoming spool inside the dryer and see if i have better results.

 

I have this: https://store.creality.com/products/creality-space-pi-filament-dryer-plus   which is currently $69 at the Creality store.  Holds two spools.  I have two:  one hooked to extruders 4 and 5 (as shown below, note the fittings I added for the PTFE tubing)  and another unattached one for processing incoming filament.  I haven't had any moisture problems since I started using them.  That said, I live in the desert southwest of the US; might not be so happy with them if I was back in Durham, North Carolina ...

When not in a dryer or hung on a machine, I keep my spools in gasketed Sterilite bins with color-changing dessicant.