Trying to remove nozzle for the first time. - Hardware, firmware and software help

RE: Trying to remove nozzle for the first time.

miroslav.h4 — Tue, 17 Mar 2026 09:37:48 +0000

You forgot to add that your note about temperatures and tightening the nozzles applies in the case of C1 or MK4 only to the combination of Nextruder nozzle extension + short E3D nozzle. For other long Nextruder nozzles, the note is irrelevant, they are one piece and the plastic cannot leak around the nozzle thread in the heating block. And these long nozzles are tightened when cold. But you write about MK3 there it is clearly stated but here what I wrote above applies.

RE: Trying to remove nozzle for the first time.

Robin_13 — Tue, 17 Mar 2026 05:44:15 +0000

You can find a nozzle tool to ensure that it is tight enough. I found that it wasn't enough since I print at higher heats. I suggest you look at what you print with and replace nozzle at 5 degrees above that temperature. You can end up with leaks if you don't get hot enough.

I learned that the default temperature on my MK3 was not hot enough and led to issues.

RE: Trying to remove nozzle for the first time.

Wejn — Mon, 16 Mar 2026 19:29:59 +0000

Posted by: @hyiger

Posted by: @phil-15
which nozzle wiper mod do you recommend? There are many and IDK which one is a good one. Thanks
Depends on what build plates you use. If you use the ones from BIQU then you need one that is compatible with the sheet. If you only use the Prusa sheets then pick anyone you like. This is what I use: https://www.printables.com/model/1416818-core-one-universal-nozzle-wiper-left-or-right-side (which happens to be designed by me)

And if you're using https://www.printables.com/model/1452284-core-one-stealthbrush-for-the-inner-monk-of-clean you can still use it with the BIQU. You just have to take wire cutters to it:

RE: Trying to remove nozzle for the first time.

hyiger — Mon, 16 Mar 2026 18:07:54 +0000

Posted by: @miroslav-h4
If the silicone isn't too torn, don't worry about it. So you could change it after every print, but that wouldn't cost you a replacement. You shouldn't be so scared. The printer likes a lot of things. That is, unless you hit it with a 3kg hammer.

The nice thing about the Core One is it can take a lot of abuse. It's really hard to damage it. Once piece of advice is to pick up a roll of Prusament PC-CF and print replacement parts. Especially the fan shroud. Or if you want to save money, order the spares from Prusa.

RE: Trying to remove nozzle for the first time.

miroslav.h4 — Mon, 16 Mar 2026 17:44:39 +0000

If the silicone isn't too torn, don't worry about it. So you could change it after every print, but that wouldn't cost you a replacement. You shouldn't be so scared. The printer likes a lot of things. That is, unless you hit it with a 3kg hammer.

RE:

hyiger — Mon, 16 Mar 2026 17:39:07 +0000

Posted by: @phil-15

which nozzle wiper mod do you recommend? There are many and IDK which one is a good one. Thanks

Depends on what build plates you use. If you use the ones from BIQU then you need one that is compatible with the sheet. If you only use the Prusa sheets then pick anyone you like. This is what I use: https://www.printables.com/model/1416818-core-one-universal-nozzle-wiper-left-or-right-side (which happens to be designed by me)

RE: Trying to remove nozzle for the first time.

Phil — Mon, 16 Mar 2026 17:36:46 +0000

which nozzle wiper mod do you recommend? There are many and IDK which one is a good one. Thanks

Posted by: @hyiger

Posted by: @phil-15
Also, is there any chance I broken anything?
Can brushing with too much force knock anything out of alignment? Not that I used too much force. But I don't know much about printers.
No. Just always check that the thumbscrews are tight before a print. Every so often, I remove the sock, heat the nozzle to 290 and brush it like I'm brushing teeth. Also, you may want to consider added a nozzle wiper mod. This will help keep the nozzle clean between prints.

RE: Trying to remove nozzle for the first time.

Phil — Mon, 16 Mar 2026 17:19:00 +0000

Also, how often should I be replacing the silicone sock. I didn't see any tears in mine, but there is some plastic gunk that has accumulated on the outside.

RE: Trying to remove nozzle for the first time.

Phil — Mon, 16 Mar 2026 17:16:51 +0000

Thanks for the advice.

I got the new nozzle installed. I only finger tightened using a 7mm socket. Is this tight enough?

Also, when I loaded filament it made a creaking noise, almost grinding noise when it loaded, and then again when the purge began. Is this normal? I loaded Prusament PETG, if that is important.

I installed a Prusa Nozzle ObXidian - 0.4 mm nozzle. In Prusa Slicer, I just changed the Printer preset to "Prusa Core One 0.4 nozzle" I don't need to change any other settings. Correct? The previous nozzle was the Prusa HF 0.4mm brass nozzle that ships with the Core One.

Sorry for being a bit of a worrier about this but I've never done it before and don't want to mess up my printer. Thanks for all the help. (As always)

RE: Trying to remove nozzle for the first time.

miroslav.h4 — Mon, 16 Mar 2026 16:52:41 +0000

Some filament residue always gets caught on the nozzle and slowly creeps up and under the silicone. There's nothing you can do about it except clean it. And if you use the nozzle replacement tool, always remove the silicone and use the correct version of the tool. Without silicone, the heating block holds better in the tool. And if you brush it with reasonable force, you can't damage anything.