Posted by: @cedric

Didnt know the others were even more brittle than Siraya, must snap of by just breathing on it :) Hyiger what profiles did you use to find siraya PPA diffucult? I found it very easy to print so far at least. 

Siraya Tech PPA (non CF) is very easy to print and doesn't require any special handling other that it has to always be dried before printing and in most cases printed from the dryer while it is drying. PPA-CF will not feed into the Nextruder without bypassing the PTFE attached to the swing arm. That is unless the single pulley variant is installed. With stock I can print only if I first manually push it in from the top of the Nextruder. After that I don't have problems printing it. 

That said, Nylon (PA) based filaments are really tedious to work with since they have to be moisture conditioned and annealed in order to make functional parts work. 

For the profiles I created my own starting with the ones provided by ST for the Bambu printers and then running the calibration tests to tweak them for the C1. I'll share them later after work. 

Regarding PPA and PPS etc, Im in the car parts world, and high temp filaments are super important for under bonnet parts, so PPA and others are quite common to see. Theres of course others that could use the strenght and stiffness of the materials, lets also not forget creep and moisture sensitivity as quite important properties. 

Didnt know the others were even more brittle than Siraya, must snap of by just breathing on it :) Hyiger what profiles did you use to find siraya PPA diffucult? I found it very easy to print so far at least. 

As far as I'm aware BL lists PPA-CF as incompatible with their AMS system due to the same reasons already stated. And then there is the fact that PPA-CF is such a niche material in that I can't think of a use case for it outside of automotive.

That's correct! The Bambu Lab PPA-CF is also very expensive, but it prints very easily. It wasn't introduced in the AMS. The filament was fed through the external port on the Bambu Lab X1C.I’d like to emphasize again that I don’t run a business that requires technical filaments for customer orders. Everything I do is for personal use—it’s a hobby. I let my ideas guide me and enjoy experimenting with new things to expand my learning curve.That’s why I think Prusa can’t cover a broad market with its HT nozzle and filaments. Just my personal opinion.

Posted by: @hyiger

As far as I'm aware BL lists PPA-CF as incompatible with their AMS system due to the same reasons already stated. And then there is the fact that PPA-CF is such a niche material in that I can't think of a use case for it outside of automotive. It could possibly be used (as a much more expensive) alternative to aluminum extrusion. But then there is the issues with layer adhesion due to the chopped fibers. Siraya Tech has a solution to this (maybe) with PPA-CF Core but then once shipping is included it's around $100/kg. I tried printing a model rocket with PPA-CF but the results were catastrophic (think opposite of the Titan sub). 

 ScreenshotIm also interested in prusas take on it, printing PPA and PPS will need changes, either reroute or idler arm, im not sure how they will tackle this, doing nothing will render that HT hot end very useless.

Hello Cédric :-)

On Reddit (r/prusa3d), Prusa has already messaged me (comment in the post) saying they’ll take this into consideration and look into it.

Screenshot

I’d say it doesn’t get any more official than that ;-)

How come you had to do the reroute aswell, to make it work on the original idler arm? Ive yet to have issues with the single wheel and standard route(only changed to slighter larger entry radius into the nextruder), though i havent run through a complete spool of PPACF yet with the smaller bend. Though i could print with original arm if i moved the bowden, as you say its quite a difference when the bowden bend follow the bend of the filament when it comes out of the spool.

After I installed the firmware, I had major issues with the idler, remember?

A modified version from Printables helped somewhat. But only if I didn't feed the filament through the original filament guide.

I have to say that the Bambu Lab PPA-CF and the Creality PPA-CF (which I used) were even stiffer than the Siraya Tec PPA-CF, and there wasn’t even half as much on those two spools. I tried printing with the original feed method several times—no chance! In the end, I did it the way Hyiger advised me in his post.

Let's be honest, the Chinese got it right from the start with the Bambu Lab X1C (for example). The feed mechanism is so well-designed that you can print everything from PLA all the way up to PPA-CF without any problems—and why? Because it was engineered so that the “curvature” of the filament can follow the “curve” of the extruder wheel.

I hope Prusa recognizes this and makes the most of it.

Good news to disprove the masses.  

We'll see.

If the Prusa HT nozzle becomes available, we'll see for ourselves how it works.

It's exciting—and will continue to be.

Long story short, I did it and rerouted everything to the LEFT.

This way, the filament can follow its natural curve without breaking at the idler.

A successful Saturday!

https://youtu.be/bo4A0K4iS_g

Enjoy.

I'll upload the files to Printables.