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)

Absolutely phenominal filament. One of if not THE strongest I've ever used. Arrived dry and well vacuum packaged. Printed very easily on a Qidi Plus 4 printer. You will need a capable printer. I had the best results at 320° hotend, 110 bed, and 70° heated chamber. The hotter the better, there was a significant increase in layer adhesion the hotter you're able to print. I tested this PP-CF out by printing a metal lathe tool. I attached the lathe cutting inserts to the part I made and was blown away to have absolutely Zero issues cutting steel with it. The forces on it were huge and it didnt even deflect. Pretty impressive stuff. Being semi crystalline it does kind of sound metallic when you've printed it properly and hit it on a hard surface. I had failures before where it hadn't gotten hot enough so however hot you think is enough- turn it up a little more. With a capable printer it also printed incredibly easily. Bridging is a bit tough when you're over 300c but it did better than I'd imagined it would. You'll want a support material if you're doing any critical bridging because once this touches itself- you won't be able to break it apart. Heat resistance is staggering as well. I put a small torch to it to test it and it didn't even care after 5 second direct flame blast. Was still hard as could be. The print finish was superb as well. I can't recommend this enough. For when you absolutely need a print to be indestructible- this is it.

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 awesome, small prints, large prints, it's sticks to the sheet without warping and prints clean with minimal stringing if the nozzle temp is set correctly and an enclosure. Interlayer adhesion and overall strength is excellent and parts are still flexible and not brittle like PLA.Once you get the correct nozzle and bed temperatures dialed in and use the correct sheet then it prints perfectly each time large or small. if using a PEI sheet then you must use Magigoo PA (or equivalent). For smaller parts you can get away with a brim. For larger parts a PA powder coated sheet works perfectly. This is not a beginners filament and

Awesome filament. My new go-to for functional prints even over PA-GF/CF. I’ve had zero stringing or clogging. Mechanical properties after printing are awesome. Very rigid but with enough flex to not be brittle. Printing has been a breeze with no warping or Shrinkage that I’ve observed at all. Dimensionally accurate with a good finish. Build plate adhesion is perfect on my smooth PEI plate with some CSR dream adhesive. Releases from the plate wonderfully but stays adhered through the print.The 1kg roll is so much more convenient than the .5kg roll that some others use. 10/10 will absolutely buy again

One of my favorite filaments so far. I use it for engineering projects at work, school and home. Reliable to print with, creates super strong and stiff parts.I use Vision Miner NPA on my bed, with a passively heated chamber (~45°C chamber) and a 0.4mm tungsten carbide nozzle. Works great, prints great. Definitely keep it dry, and in a dry box when not in use. It is a bit odorous, as most fiber filled/high end polymers are, so definitely would recommend a chamber filter.