Cold Pull process?  

RE: Cold Pull process?

I don't see why it would be different than on the Mk4S: https://help.prusa3d.com/article/cold-pull-mk4-s-mk3-9-s-xl-13702-17702_445071

I usually just run 3 or 4 purges of cleaning filament after printing PC-CF.

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You're right, automatic cold pull is not in the (current version of the) menu.

However, the manual procedure for the early versions of the XL and Mk4 will work, the nextruder is the same.

Cheerio,

RE: Cold Pull process?

Ya it is just not easy.   Basically need to pull the plastic top in order to do that process.   Guess it is time to make it magnetic or hinged.

RE:

What do you need to take apart to do the manual process other than disconnect the ptfe tube? 

RE: Cold Pull process?

if you want to disconnect the ptfe tube on the Core One you need to take the top plastic cover off.

RE: Cold Pull process?

I got rid of all the rivets in the lid. 

RE: Cold Pull process?

I have now too 🙂  haha

RE: Cold Pull process?

I will probably do this - there really isn't a need for them to be there TBH. The weight of the panel will keep it in place regardless.

Posted by: @foxrun3d

I got rid of all the rivets in the lid. 

RE: Cold Pull process?

I bet someone designs a hinged lid like on the original enclosure.

RE: Cold Pull process?

There are a couple of designs for magnetic clips already but I think the design of the enclosure doesn't seem to lend itself to anything really great.

RE: Cold Pull process?

Not sure where I read that -- but someone suggested sticking those 1 cm wide, adhesive magnetic strips to the underside of lid, all around the perimeter. They should create a nice seal with the steel enclosure frame.

RE: Cold Pull process?

Honestly I don't think any of that is really necessary. Just put the lid on, and it's fine. At least I haven't seen any impact on its ability to heat up the interior of the enclosure without the rivets. 

RE: Cold Pull process?

I have not personally seen or touched the lid of course -- in the videos it look awfully wobbly. But yes, as long as you don't want to put anything on top, it will probably stay in place. (The material might have done with an extra millimeter of thickness, actually -- it does not exactly shout "quality!". I see an aftermarket upgrade on the horizon...) 

RE: Cold Pull process?

There's really no problem putting things on top 🙂 I don't find it wobbly. There's holes in each corner that go around screws in the frame that keep it from moving laterally.

RE: Cold Pull process?

I'm still waiting for the kit so I can't try it. When I look at the photos and videos, it seems to me that theoretically there should be a place above the extruder for inserting the filament and then cold pulling it out. Or am I wrong? I don't think Prusa would have deliberately disabled this technique when it is necessary to do it after replacing the high-temperature filament with a filament such as PLA.Personally, I would be quite sad because I want to put the COREBOXXon top and in the future the MMU3

RE: Cold Pull process?

Without taking off the lid, I don't really see how you can do it. There's may a couple of inches max between the top of the extruder and the lid. Theoretically, I could probably get some filament in there but it would be very awkward

RE: Cold Pull process?

Posted by: @foxrun3d

Without taking off the lid, I don't really see how you can do it. There's may a couple of inches max between the top of the extruder and the lid. Theoretically, I could probably get some filament in there but it would be very awkward

So how would that work with the MMU on top, as depicted in the January Prusa blog? While the tank-like appearance of the lid is not final according to the blog (will be transparent and maybe with a slightly different shape), I understand the general mounting position of the MMU will remain as shown. And it seems to block most of the top access to the printer.

RE: Cold Pull process?

No idea. I sincerely hope this won't be the final design as it looks just bad in its brutality in this day and age. I certainly don't want to have spools sit next to my printer (because there's another printer there) but I guess I could route the tubes to spools on a RepRack above. I'd much rather see a COREBOXX like design (one reason I haven't built one yet, as I'm holding out hope for Prusa to do something like it. Yes, I know. I'm a dreamer ☹️)

To go back to the original question, I guess you'll have to take everything (lid, MMU, spools and COREBOXX or equivalent) off to reach the top of the extruder.

RE:

I took a couple of pictures.  There is about 6mm or so between the bend in the tube and the top.   So no real way to pull it off without removing the top.  My top now just sits on it.   The first picture is top down view.  Shows the black protective elbow they put on it.  and the second photo is from the side, trying to show how much space is between them.