PPA-CF and PPS-CF?

MrSteve

Hey all, I’m currently in the process of making my own orca out of PET-CF and PLA Pro, and was just browsing some of the other filaments Bambu labs offers. I came across these 2 filaments in the title that are only distributed through authorized sellers in select locations. The impact and strength of these parts seems a bit lower, but they seem to have a Much higher thermal resistance than the Pet CF and nylons.
Personally i would love to try out these filaments but my printer can’t reach the necessary temperatures to even melt this stuff to print it.
Would these filaments be an even better long term replacement to pet cf and nylons due to their greater thermal resistance? If not, would they still have merit in places like silencer internals or maybe even as a risky sort of barrel?
Link to the Bambu filaments based off of thermal resistance : https://bambulab.com/en-us/filament/collections/heat-resistant

hoffmantactical

I need to look into it more. The PPA-CF Is interesting due to the insane (30 KPSI) tensile strength claimed by Bambu. Now the HDT was not that much better then PET-CF, looking at the glass transition temp I'd say they are pretty similar in that regard. The even lower impact resistance is a concern. Since it's out of stock I've not been able to get a roll to test.

Because layer adhesion becomes the main limiting factor on prints like the Orca, I suspect the PPA-CF will have little advantage if any over the PET-CF.

PistollPeet

I’ve recently picked up Qidi PAHT-cf to try some cf parts on my ender. Looking online at their website it’s also listed as ppa-cf. I haven’t used it yet but the ratings look interesting and it’s in stock 👍

MaliciousFetus

Does Anyone know if PPA-CF has bad creep or if it needs any annealing or anything? I'm interested in making my orca out of it but I can't find if it needs to be annealed. I've seen on various websites that it has better "dimensional stability" than PA6/12/612, would this point to it having low creep? @HT I'd be super interested to see a test comparing this to other types of choice nylons and other filaments.

hoffmantactical

MaliciousFetus I need to get my hands on some. Don't know how it creeps right now.

10yrCompositesEngnr

MaliciousFetus polymaker does recommend 16 hours at 100C for annealing their (ppa)paht-cf. heat deflection temp is 215c for ppa, so 425f, which is phenomenal.

I printed an sl-15 from siraya tech pet-cf on my enclosed neptune 4 pro as my first printed pew pew, and finally got out to the range 6 months later. 130 rounds in the first range session with no issues, including 2 30 rounds mag dumps. All other components were cheap psa kit parts. Can’t speak to creep though.

I recently got a qidi plus4 to do some high temp commercial jobs for composite cures with ultem and PPS prototype molds, so i cranked out a couple Sl-9 lowers, and just started an orca upper.

I was planning on polymaker pps-cf20 for the barrel mounts and clips, but read that pet is recommended due to creep over “most nylons” . Curious if there have been any other findings on this. Given what i’ve seen, i feel relatively safe running the ppa, but better is better, and I’m all about optimization.

hoffmantactical

10yrCompositesEngnr PPS would be a great option for the barrel mounts, though may be a bit brittle for the clips. Does Polymaker make a "HT" PPA-CF? I know Siraya does.

10yrCompositesEngnr

hoffmantactical they do. The fiberon branded pa6cf-20 is ppa. They have a tds on their website showing a 215c hdt. The strength at temp is surprisingly lower when “wet” than pet however, so it does seem that pet would be a better choice for the clips, as you mentioned in your documentation already.

This new printer can also do pps, which has even better thermal stability than ppa, but i’m not sure about the rest of the properties at temp. Might have to try the barrel mounts from that, though it’s pricey stuff.

500g pps pa6 roll on amazon
https://a.co/d/7F25pdA
2kg, better price per kg. different branding, but the same material:
https://a.co/d/4nSRtMG
Pps:
https://a.co/d/7RtyVoO

Cf6 polymaker Tds:
https://fiberon.polymaker.com/wp-content/uploads/TDS_FIBERON-PA6-CF20_V1.0_EN.pdf

Polymaker Pps tds
https://fiberon.polymaker.com/wp-content/uploads/TDS_FIBERON-PPS-CF10_V1.1_EN.pdf

hoffmantactical

Unless they changed it, I thought the PA6-CF20 was just a rebrand of their old PA6-CF? The loss of stiffness when wet suggests this. The only PPA-CF filaments I know of are the Bambu and the Siraya Tech PAHT-CF.

Submerged3Dprints

Just wondering if anybody has done the leg work regarding the drying specs Bambu announced for their PPA-CF

From Bambu's website -> Drying Settings (Blast Drying Oven) 100 - 140°C, 8 - 12 h

I've watched a bunch of videos on the topic, looked at the way the Mech Eng professor was doing the dryer test in his channel "My Tech Fun" (I am still waiting for him to produce the video where he will be testing that PPA-CF) he surely will be covering the drying process as always.

I stumbled across someone testing an AirFryer. But I am concerned the heat element would directly radiate over the spool and I would need to install multiple temp sensor to get a reading of the temps and prevent a catastrophe.