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)

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 280-300Bed 80-100Speed 30-220Fan 0-80On the spool, it saysNozzle 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.

This filament is extremely strong, probably the strongest I’ve come across to date. It has a separate core with carbon fiber making the outside of your print smoother. With this being said, it should be noted that this stuff will NOT run well in a high flow nozzle that uses separate flow ducts such as with a CHT nozzle. It will extrude however your parts will have a very rough finish. Use a standard flow hardened nozzle, print slow and hot and you should be good. I run this at 300c, it will run on less however layer adhesion will decrease which I assume most buying this filament will not want.

The media could not be loaded. I am reviewing the CF PET and PPA CF.First PET-CF. I have wanted to try some engineering materials for a long time. I have a very highly modified ender 3 that prints up to 350c. I was always turned off by different CF filaments because I read that nylon and PC properties change over time once they absorb moisture and in general, CF filaments have lower layer adhesion than PLA. I consistently experience issues with creep using PLA and even ABS/ASA. And I have read that nylon has the same issues. As well as the other engineering filaments being more expensive. Until I started hearing about 3Rd party testing results about CF PET. I started to really like what I was researching about CF PET. Virtually zero creep, very minimal moisture absorption, and consistent strength across the lifespan of printer parts. Good layer adhesion, better than most nylons, and almost zero warping during prints and incredible first layer adhesion?? Plus it is affordable. What could be better. This really seems like the goldilocks filament. I was already wanting to buy some and then I read Mark’s comments on Hoffman’s videos and that was what got me to purchase this filament and MAN am I glad I did. My very first print ever with ANY engineering material and It was so easy and painless. I opened 3 beers with this CF PET bottle opener and there is virtually no wear and tear and this part is only 2 walls and 10% infill 0.6mm nozzle. No other filament i have used compares, it is incredibly stiff, very light, and strong as heck, i could not break this with my bear hands if i tried. I haven’t even tuned flow rates or temps yet. I cannot wait to build structural thin parts with this. It’s a very hard material that does not scratch easy. I can’t wait until the CF Core materials come out.PPA-CF: I just calibrated flow and made my first print which is the Adjustable wrench. The default QIDI settings from siraya were pretty much perfect except I bumped flow up a few percent after running orca calibration. The tolerances of my part are perfect (0.05mm). Supposed to let the parts naturally slowly cool inside the enclosure for maximum strength. Dont pull the print out hot. I couldnt even break the Orca flow calibration swatches. It’s incredible stuff for a good price. I had zero issues with moisture out of the packaging. I immediately loaded it into my 70c dryer and printed straight from that. I had absolutely zero issues feeding it all the way through my bowden tubes from the dryer to the nozzle which impressed me. Printing perfect parts with CF nylon first try is amazing. This is the future!