Nylon and Carbon fibre on MK4S  

RE: Nylon and Carbon fibre on MK4S

The nozzle in the kit is listed as brass CHT, so no for abrasive filaments.   The Prusa parts lists all Brass CHT nozzles currently.  Hopefully there will be hardened Prusa CHT nozzles eventually.  I have a diamond tip V6 nozzle and like that I don't have to switch nozzles unless it is for size.   It may be a while before I can get a CHT diamond answer. 

CHT as I understand it helps on layer thickness and speed on fast prints.  Prusa states that the profiles for structural with a CHT have not changed to assure proper adhesion for strength.     CHT doesn't make everything faster. 

RE: Nylon and Carbon fibre on MK4S

Thanks for the reply, I hadn't found the cht info on the Prusa site. I guess it's an improvement for pla and petg. I usually change nozzles for anything else so no change. I'm going to assume the V6 adapter is the same as nothing else seems to have changed apart from cooling.

RE: Nylon and Carbon fibre on MK4S

This is what I bought for my MK4S for printing CF material:
https://www.prusa3d.com/product/e3d-prusa-nozzle-high-flow-obxidian-0-4-mm/

RE: Nylon and Carbon fibre on MK4S

Thanks for the link Mike, thats looks ideal for PC, so would meet most of my use. Have you used it with carbon loaded PC or nylon? I'm not clear if any of the high flow nozzles are ok for that.  Can you cold pull a high volume nozzle?

I've gone for the S update now so awaiting delivery.

RE:

Hi Paul,

I need the nozzle for Polymaker's ESD-PETG (so no nylon but CF fibers).

There is also a non-HF version of the ObXidian Nozzle for the MK4S:
https://www.prusa3d.com/product/prusa-nozzle-obxidian-0-4-mm-2

Can you cold pull a high volume nozzle?

Haven't tried yet but according to Prusa (don't recall where I was reading it) there are mixed chances for cold pull to be working with HF nozzles.

RE: Nylon and Carbon fibre on MK4S

Thanks,

reading the write-up in your link it does say its ideal for fibre loaded filaments so it looks like the ideal nozzle with the S upgrade.

All the best,

Paul

RE: Nylon and Carbon fibre on MK4S

Also if you are interested you can read on E3D's website about ObXidian. It even contains rainbows and unicorns. 🤣 

This is from E3D:

With a wear resistance that is orders of magnitude higher than any other E3D nozzle, ObXidian is really hard. Several orders of magnitude harder than Nozzle X and indeed any other generic hardened steel nozzle.

This is achieved by pairing a tool steel insert with our new E3DLC™ coating. This specially formulated coating also embeds non-stick properties into the Nozzle itself. Meaning considerably less plastic build-up around the Nozzle.

ObXidian™ coated nozzles are exceptionally wear resistant compared to other products on the market and significantly outperform other hardened nozzles. Improvements in ‘exotic’ engineering filaments mean that some new materials which include aggressive fillers, including but not limited to Polymaker’s PolyMide range, can cause significant wear on even ObXidian nozzles. E3D is actively developing even more specialist solutions for these materials. In the meantime please be aware that even the rainbows and unicorns in your ObXidian nozzle are not everlasting under extreme material conditions.

RE: Nylon and Carbon fibre on MK4S

Is it a drop in replacement? Did you have to do any retuning or calibration?

RE:

It's not a complete drop-in unfortunately since the E3D one (currently the only one available if you want high-flow) sits a bit higher. So there are two differen nozzle replace tools you can print, one for prusa nozzles and one for E3D. Not ideal.
Tuning/calibration is not required afterwards since the sensor in the Nextruder assembly will recognize the any slightly modified nozzle position when it touches the build plate during homing.

RE:

@campblor, since I edited my post this afternoon and all was gone because I passed some time limit after which editing is possible I was to lazy to start again.

But now it's evening and I'm adding some more information.
If you don't need HF nozzle you can also go for the non-HF hardened nozzle ( https://www.prusa3d.com/product/prusa-nozzle-obxidian-0-4-mm-2 ). This can be replaced with the same tool as the regular brass nozzle. So this will be the  drop-in replacement you were asking for.

But neither the HF ObXidian nor the "regular" ObXidian nozzle will require any sort of special tuning/calibration.

RE: Nylon and Carbon fibre on MK4S

Thanks buddy. I've got a MK4S kit in my basket with a 0.4mm Obxidian HF nozzle. I know when I got an Obxidian for my MK3S back in the day I had to do all the thermal calibration etc. 

RE: Nylon and Carbon fibre on MK4S

I have obxidian with v6 adapter and it performs as good as brass nextruder nozzle. HF e3d obxidian for nextruder is under extruding, stringing and leave blobs and artifacts. Can you share your solution @Mike1D