Siraya Tech Fibreheart PET-CF 3D Filament - Carbon Fiber Reinforced, High Strength & Rigidity, Easy Print, Dimensionally Stable, Aluminum Foil Sealed Bag - for Strong and Precise Parts (Black, 1kg)

Siraya Tech PPA-CF is a prototype engineer’s dream. While most nylons have flexural strength that far exceeds PLA, they generally still lag behind it in flexural modulus (stiffness) limiting their utility in structural applications. The Siraya Tech PPA-CF is very much an exception to this and delivers 3 times the stiffness of PLA whilst maintaining 5 times the tensile strength. From the perspective of hydroscopy, the Siraya Tech PPA-CF has considerably less tendency to absorb atmospheric moisture than PA-11, PA-12 and PA-6. I find that it can print very well right out of the factory sealed pouch with no additional drying needed. This is a great time saver when on a tight project schedule, as the typical drying protocol for most high-temp nylons is 85 deg C for 8-12 hours in a blast oven. I print Siraya Tech PPA-CF mostly from a Bambu Lab X1E. It prints perfectly using the stock profile for Bambu Lab PAHT-CF. So, the big debate is whether if Siraya Tech PPA-CF is PAHT-CF or not, especially since it used to be labeled as such. So, here’s the scoop: PAHT-CF is just generic nomenclature for “Polyamide High Temperature”. The polyamide can be PA-11 or PA-12, which is then blended with carbon fiber ergo the “CF” designation. Bambu Lab PAHT-CF uses PA-12 as the polyamide base. Siraya Tech PPA-CF and Bambu Lab PPA-CF are technically PAHTs, but use *polypthalamide* as the base. So, all PPAs are PAHTs, but not all PAHTs are PPA. The thing about PPA is that its higher strength, greater stiffness, and increased temperature resistance generally comes with a much higher price tag. Comparatively, Siraya Tech PPA and Bambu Lab PPA complete my tests with similar results and appear to be the same compound. However, the Siraya Tech PPA is 40% less expensive. Take what you will from that, but your wallet will notice the difference. What I like most about Siraya Tech PPA-CF is the dimensional stability of the material. Whatever design I prototype with it can directly transfer for DMLS printing in stainless steel, titanium and aluminum without tweaks to the dimensions. Other PAHT-CF filaments based on PA-12 have far more issues with shrinking on the Z-axis, warping, and lifting of edges off the build plate. I’ve been printing with Siraya Tech PPA for about 1,600 hours now, and have not experienced warping or lifting on any print with it yet. Now, for the challenges: Siraya Tech PPA-CF is so very stiff that the filament on the spool retains a coil memory like spring steel. That means that you cannot run lengths of it through stiff feeder tubes (such as PTFE Bowden tubes) from your dry box to your printer. It needs to follow its own coiled memory, and if forced to run through the contours of stiff feeder tubes, the filament will seize up in the tubes and then snap (break). See my attached photo. I use tubes made from oversized, flexible, latex tubing (blue color in the photo) to feed the Siraya Tech PPA-CF from my dry box to my printer. Note the cork-screw or pig-tail profile of the filament and feed tube — you must allow the filament to gradually uncoil itself or else you will have filament jams and breakage all day long. Do what I have done in the pic and save yourself a ton of headaches. Don’t do it and, well, you’ll be very frustrated and unhappy. The extreme stiffness of the Siraya Tech PPA-CF also means that getting it to catch into and engage your extruder gears when initially loading the filament can take 3-5 tries. I have found that cutting the end of the filament at a very steep angle to create a very sharp, sliver point really helps. You need very sharp, new clippers / nippers to do this otherwise the filament will crack apart and leave a ragged point. Don’t even think about re-spooling the Siraya Tech PPA-CF or using it in your AMS or CFS. I tried re-spooling it at very slow speed and the filament snapped three times over the 1 kg transfer. So, that was a one time and never again experiment for me. Why did I try re-spooling? Answer: virtually all the moisture in the roll is within the cardboard spool and not the filament. I have found that blast-oven drying of a new roll of the Siraya Tech PPA-CF is not needed to reduce moisture from the filament, but to get it out of the cardboard spool. I wish filament makers would quit with the hydroscopic cardboard spools and go back to using the hydrophobic plastic spools for these premium, nylon filaments. In my attached photo, you can see two dry-boxes, the one on the left reading 19% humidity has the Siraya Tech PPA-CF with cardboard spool in it, and the one on the right reading 14% humidity has Colorfabb Varioshore TPU with plastic spool in it. Both dry boxes were at 10% humidity before the filament rolls were inserted after 12 hours of drying in a blast oven at 85 deg C and 75 deg C respectively. Both dry boxes have about 500 grams of supplemental, gel bead desiccant. The carbon fiber content of the Siraya Tech PPA-CF is very high. This means that the material is extremely abrasive, though I have found a hardened, steel nozzle (0.4 mm) to have no appreciable wear after 1600 hours printing it. Hardened is the operative word. Use unhardened stainless steel or any softer metal in your nozzle selection with this filament and you’ll be replacing it after every 0.5 kg you run through it. Nozzle clogs. The Siraya Tech PPA-CF does cause more nozzle clogs to form in my printer, at a rate of about once per 1 kg spool. I attribute this to the high density of the carbon fiber content. None of the clogs has been a showstopper or fatal event requiring tear down of the hot end and replacement of the nozzle. Every time, I just heat the nozzle to 300 deg C, and then run a 0.35 mm and 0.4 mm acupuncture needle through it for about 20 strokes each and am ready to resume printing. Overhang performance. The Sirayatech PPA-CF droops on overhangs steeper than 40% more than PLA-CF and PA-12 based PAHT-CF. Its overhang performance is about equal to PETG. Not bad, but not great either, though satisfactory overall. Using ASA as a support material works great with zero gaps, but you will need a dual nozzle printer for this. Be careful when using the PPA-CF as a support material for itself as the support structures are very difficult to remove if you gap closer than 0.25 mm. I find that grid support pattern with no interface layer works much better than tree type support when using Siraya Tech PPA-CF as a support material for itself. The surface texture of the Siraya Tech PPA-CF is absolutely gorgeous — with a modestly iridescent sheen like silk satin. It hides layer lines well on medium to large prints. Surprisingly, despite its seemingly high density of carbon fiber content, I have experienced zero problems with prickliness or carbon fiber splinters coming off the prints into my skin on printed hand-grips. Color. While the Siraya Tech PPA-CF looks coal black when standing alone, when compared to other black pigmented filaments it is actually more of a very dark gunmetal gray. This is not unattractive at all, in my opinion, but if you need a jet black color then take note. Stiffness. As cited earlier, the Siraya Tech PPA-CF has extreme stiffness compared with other polyamides / nylons. While this is a plus for many structural applications, it does come at the expense of ductility. So, if your prints need maximum shearing strength on the Z-axis, PPA-CF is not the top performer. Annealing. Do not do this with parts printed from PPA-CF. While it will improve X and Y axis strength, it will actually reduce z-axis strength. Overall, I like Siraya Tech PPA-CF very much for its excellent balance of performance and price with the highest stiffness rating of any polyamide / nylon filament by far, and it has become my go-to standard filament for my engineering prototyping tasks. Its combination of strength and stiffness is particularly noticeable on thin parts which resonate like metal when tapped.

I printed a mechanical piece that I had printed with PLA Professional. Using that filament, everything fit and worked properly. I found this needed 290 nozzle and 90 bed in a Creality soft-sided enclosure on an Aritllery X4 Plus S1 using it's PEI sheet with glue stick. I printed on the Y axis. At 280/80 one side of the base layer pulled loose when the oblong item was printed aligned on the X axis. I printed a .2mm layer height at 100mm/s with fans 20-60%, 2mm retraction @ 40mm/s and 100% infill. See below for print setting conflicts. I used this filament right out of the bag, as it says on the site not to dry it unless you have problems. Once the part printed, I was able to get the supports out relatively easily, and the surface while not smooth was decent. This portion was a marked improvement over the Overture Easy Nylon I tried before. I then removed an internal metal support from the same model in PLA plus and it would not fit into the same opening. I tried to push it into place and the front portion of the pocket cracked, turning the model into 3 pieces. This material is very brittle. A second larger metallic piece designed to be removable fit most of the way in, but jammed once seated. It easily pulls in and out of the PLA plus. I have deducted one star for various reasons- 1. The print settings vary between what is on the bag (I got old stock marked PAHT) and what is on the website. 2. The shrinkage made my item unusable. I'll have to experiment to get the enlargement right in Cura. UPDATE- can't be done, see below. If you go by the label on the bag, here are the print settings: Nozzle 280-300 Bed 80-100 Speed 30-220 Fan 0-80 On the spool, it says Nozzle 280-300 (same) Bed 80-100 (same) Speed 30-200 (slightly lower) Fan 0-80 (same) On their website (product page), it says this: Nozzle 260-280 (lower) Bed 70-80 (lower) Speed 30-120 (lower) Fan 20-60 (lower) On their website's user guide, it says this: Nozzle Temperature 280-300 (same as bag) Bed 70-80 (lower than bag, same as product page) Speed 30-120 (same as product page) Fan 20-60 (same as product page) UPDATE- Reduced to 2 stars. This material is just not suited for precision printing. I adjusted my model in Cura after measuring the failed piece and one that printed OK as-is in PLA Professional. I added 7% to X and 2% to Y and Z. I also reduced layer height to .16. While the support fit in the pocket this time, the locking pin that holds it in place would not go all the way through. It started on one side, and it ended up cracking in the exact same spot as before when I tried to drive it into place as designed- something PLA Pro has no problem with. I also found there was too much slack for the other part that fit into the model. Seems like nice material, but just not suited for what I needed it for. You shouldn't have to spend so much time dialing in shrinkage for such an expensive filament when filaments that are about 1/3 the cost don't have this problem. UPDATE 2- The seller contacted me and advised the website setting were correct, then offered to refund my money. Revised up to 5 stars, that is how to correct a problem.

I have no idea how they pulled it off, but this filament has some of the most insane layer adhesion I've ever seen. And it bonds so aggressively to the bed that it actually fused to my textured PEI plate at 80°C. I had to switch to smooth PEI + glue stick at 50°C just to tame the adhesion to a usable level—and it worked. The glass fiber reinforcement makes it incredibly tough, stabilizes the material, and virtually eliminates warping, so small prints come out great even without a heated chamber. Thanks to the glass fibers, the surface has this beautiful, elegant, non-reflective matte texture that completely masks layer lines—but only at 0.15 mm layer height (or finer). Any higher (like 0.20 mm and up), and the lines start to show. It prints flawlessly at 80 mm/s with a 305°C nozzle temperature. Unfortunately, that's a bit past the limit of the Bambu-style hotend I'm using, but so far it's holding up pretty well. I'm genuinely impressed. The parts come out right the first time with accuracy and uniformity that put ASA and ABS to shame. I did dry the filament for 24 hours, but honestly it seemed printable straight out of the package. The team at Siraya clearly aren't messing around—they know how to get things done. I've never consistently hit 0.1 mm dimensional accuracy with any other filament so effortlessly; it was always 0.4 mm or worse and required endless tweaking. But yeah, I did ruin a build plate because of the ridiculous adhesion—but it's totally my fault. I was completely unprepared for such a game-changing material. I can finally print thin parts with confidence, and I no longer have to make multiple copies just to get a perfect fitment.

Top!!! Lässt sich super drucken. Zero Warp. Perfekte interlayer Haftung. Bislang keine Probleme durch Materialzuführung vom AMS-HT.

寸法精度が良くて扱いやすいエンプラとして使ってみました。 Bambu P1Sでプリントしました。Siraya Techに印刷プロファイルがあるのでそれをすこし変更して使いました。SuperTackのプレート温度が35度でしたが65度に変更しました。 Smooth PEIは使わないほうが良いです。定着が良すぎてプレートを壊してしまいました。SuperTack推奨です。ベッド温度が低くできて白化しにくくなります。 他のエンプラと違って湿気にも強くリーズナブルでとても良い。 ー追記ー Smooth PEIですがのり（ケープ3Dエクストラキープ）を使えば無事に剥離できました。

Il PET-CF (non PETG!!) è il mio filamento "ingegneristico" preferito, resiste a temperature altissime, non diventa morbido con il calore, non si deforma sotto sforzo, non si restringe dopo averlo stampato (quasi l'opposto dell'ABS) e questo in particolare è veramente semplice da stampare usando i profili che Siraya Tech include. Attenzione però, Siraya usa delle fibre di carbonio abbastanza lunghe per avere un filamento più forte ma questo vuol dire che stampandolo con un ugello da 0.4mm è quasi garantito che si intasi, e poi pulirlo è praticamente impossibile. Con uno 0.6 ho avuto 0 problemi, e le parti escono comunque molto belle.

Materiale ottimo. Quello che stampo a temperatura più alta di tutti. I parametri di stampa per la mia K1C sono copiati dal sito del produttore ed adattati per Creality Print. Perfetto al primo colpo. Resistentissimo. Rigido. Ottima finitura layer e superficiale.

Amazing filament and works well at 300c on my P1S, has some seriously impressive properties as seen on MyTechFun but prints easy too. Stronger in multiple ways than Peek at a fraction of the price. Bambu will need to drop the cost of their PPA CF if they want to compete with this one! Can withstand 200c ambient temps without any issues so great for printing desiccant holders that you don’t need to empty to recharge in an oven. Considerations: Prior to melting the filament is extremely brittle and abrasive so do not use in an AMS or similar MMS. Instead used an external spool with a short Bowden tube and no sharp bends. I used a heated chamber mod but have also seen great results at ambient. If you are using Bambu Studio select their PPA-CF (as of the date of posting theirs not a generic one) and edit the filament settings to 300c. The results are great but it’s certainly not for beginners, it won’t load via the standard Bambu loading method (as this goes up to 250c) so you’ll need to manually set the printer to 300c and hit extrude yourself to purge and extrude it. Conclusion: Siraya are barely known in the FDM market (more so resin for SLA) so for their first few filaments to be this good is pretty disruptive and it’s priced extremely well. Looking forward to trying their PPA CF Core once it’s available in the UK.